Fix spacing and refactor code

Author: judynash

core/src/main/scala/org/apache/spark/util/Utils.scala

@@ -439,13 +439,12 @@ private[spark] object Utils extends Logging {
       executeAndGetOutput(Seq("tar", "-xf", fileName), targetDir)
     }
     // Make the file executable - That's necessary for scripts
-    if(isWindows){
-      // Windows does not grant read permission by default to non-admin users
-      // Add read permission to owner explicitly
+    FileUtil.chmod(targetFile.getAbsolutePath, "a+x")
+
+    // Windows does not grant read permission by default to non-admin users
+    // Add read permission to owner explicitly
+    if (isWindows){
       FileUtil.chmod(targetFile.getAbsolutePath, "u+r")
-      FileUtil.chmod(targetFile.getAbsolutePath, "a+x")
-    } else {
-      FileUtil.chmod(targetFile.getAbsolutePath, "a+x")
     }
   }