minor fix to comments.

Author: Xing Lin

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/ViewFileSystem.java

@@ -1222,7 +1222,6 @@ public Path getTrashRoot(Path path) {
   public Collection<FileStatus> getTrashRoots(boolean allUsers) {
     // A map from targetFSPath -> FileStatus.
     // FileStatus can be from targetFS or viewFS.
-
     HashMap<Path, FileStatus> trashRoots = new HashMap<>();
     for (FileSystem fs : getChildFileSystems()) {
       for (FileStatus trash : fs.getTrashRoots(allUsers)) {

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/viewfs/ViewFileSystemBaseTest.java

@@ -1129,12 +1129,11 @@ public void testTrashRootForceInsideMountPoint() throws IOException {
         new Path("/data/" + TRASH_PREFIX + "/" + ugi.getShortUserName()));
     Assert.assertEquals(dataTrashRoot, fsView2.getTrashRoot(dataTestPath));
 
-    // Case 2: path p not found in mount table, fall back to the default FS
-    // Return a trash root in mount point "/"
+    // Case 2: path p not found in mount table.
+    // Return a trash root in fallback FS.
     Path nonExistentPath = new Path("/nonExistentDir/nonExistentFile");
     Path expectedTrash =
         fsView2.makeQualified(getTrashRootInFallBackFS());
-
     Assert.assertEquals(expectedTrash, fsView2.getTrashRoot(nonExistentPath));
 
     // Case 3: turn off the CONFIG_VIEWFS_TRASH_FORCE_INSIDE_MOUNT_POINT flag.