HDDS-2257. Fix checkstyle issues in ChecksumByteBuffer

[vivekratnavel]

Fix these checkstyle issues

hadoop-hdds/common/src/main/java/org/apache/hadoop/ozone/common/ChecksumByteBuffer.java
84: Inner assignments should be avoided.
85: Inner assignments should be avoided.
101: 'case' child has incorrect indentation level 8, expected level should be 6.
102: 'case' child has incorrect indentation level 8, expected level should be 6.
103: 'case' child has incorrect indentation level 8, expected level should be 6.
104: 'case' child has incorrect indentation level 8, expected level should be 6.
105: 'case' child has incorrect indentation level 8, expected level should be 6.
106: 'case' child has incorrect indentation level 8, expected level should be 6.
107: 'case' child has incorrect indentation level 8, expected level should be 6.
108: 'case' child has incorrect indentation level 8, expected level should be 6.

[vivekratnavel]

/label ozone

[vivekratnavel]

cc @bharatviswa504

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
0	reexec	41	Docker mode activated.
		_ Prechecks _
+1	dupname	0	No case conflicting files found.
+1	@author	0	The patch does not contain any @author tags.
-1	test4tests	0	The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch.
		_ trunk Compile Tests _
-1	mvninstall	36	hadoop-hdds in trunk failed.
-1	mvninstall	38	hadoop-ozone in trunk failed.
-1	compile	22	hadoop-hdds in trunk failed.
-1	compile	15	hadoop-ozone in trunk failed.
+1	checkstyle	62	trunk passed
+1	mvnsite	0	trunk passed
+1	shadedclient	1074	branch has no errors when building and testing our client artifacts.
-1	javadoc	21	hadoop-hdds in trunk failed.
-1	javadoc	20	hadoop-ozone in trunk failed.
0	spotbugs	1179	Used deprecated FindBugs config; considering switching to SpotBugs.
-1	findbugs	40	hadoop-hdds in trunk failed.
-1	findbugs	19	hadoop-ozone in trunk failed.
		_ Patch Compile Tests _
-1	mvninstall	40	hadoop-hdds in the patch failed.
-1	mvninstall	39	hadoop-ozone in the patch failed.
-1	compile	23	hadoop-hdds in the patch failed.
-1	compile	17	hadoop-ozone in the patch failed.
-1	javac	23	hadoop-hdds in the patch failed.
-1	javac	17	hadoop-ozone in the patch failed.
+1	checkstyle	34	hadoop-hdds: The patch generated 0 new + 0 unchanged - 10 fixed = 0 total (was 10)
+1	checkstyle	33	The patch passed checkstyle in hadoop-ozone
+1	mvnsite	0	the patch passed
+1	whitespace	0	The patch has no whitespace issues.
+1	shadedclient	993	patch has no errors when building and testing our client artifacts.
-1	javadoc	24	hadoop-hdds in the patch failed.
-1	javadoc	19	hadoop-ozone in the patch failed.
-1	findbugs	36	hadoop-hdds in the patch failed.
-1	findbugs	20	hadoop-ozone in the patch failed.
		_ Other Tests _
-1	unit	27	hadoop-hdds in the patch failed.
-1	unit	26	hadoop-ozone in the patch failed.
+1	asflicense	35	The patch does not generate ASF License warnings.
		2893

Subsystem	Report/Notes
Docker	Client=19.03.2 Server=19.03.2 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/Dockerfile
GITHUB PR	#1603
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient findbugs checkstyle
uname	Linux 6f442b317358 4.15.0-60-generic #67-Ubuntu SMP Thu Aug 22 16:55:30 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/hadoop.sh
git revision	trunk / a3cf54c
Default Java	1.8.0_222
mvninstall	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/branch-mvninstall-hadoop-hdds.txt
mvninstall	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/branch-mvninstall-hadoop-ozone.txt
compile	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/branch-compile-hadoop-hdds.txt
compile	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/branch-compile-hadoop-ozone.txt
javadoc	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/branch-javadoc-hadoop-hdds.txt
javadoc	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/branch-javadoc-hadoop-ozone.txt
findbugs	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/branch-findbugs-hadoop-hdds.txt
findbugs	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/branch-findbugs-hadoop-ozone.txt
mvninstall	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/patch-mvninstall-hadoop-hdds.txt
mvninstall	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/patch-mvninstall-hadoop-ozone.txt
compile	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/patch-compile-hadoop-hdds.txt
compile	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/patch-compile-hadoop-ozone.txt
javac	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/patch-compile-hadoop-hdds.txt
javac	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/patch-compile-hadoop-ozone.txt
javadoc	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/patch-javadoc-hadoop-hdds.txt
javadoc	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/patch-javadoc-hadoop-ozone.txt
findbugs	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/patch-findbugs-hadoop-hdds.txt
findbugs	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/patch-findbugs-hadoop-ozone.txt
unit	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/patch-unit-hadoop-hdds.txt
unit	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/artifact/out/patch-unit-hadoop-ozone.txt
Test Results	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/testReport/
Max. process+thread count	306 (vs. ulimit of 5500)
modules	C: hadoop-hdds/common U: hadoop-hdds/common
Console output	https://builds.apache.org/job/hadoop-multibranch/job/PR-1603/1/console
versions	git=2.7.4 maven=3.3.9
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[bharatviswa504]

+1 LGTM.
As CI has no checkstyle issues, I will commit this.
Thank You @vivekratnavel for the contribution.