Fix cpplint whitespace/comments issues

Change-Id: Iae286862c85fb8fd8901eae1204cd6d271d69496
diff --git a/runtime/native/java_lang_Thread.cc b/runtime/native/java_lang_Thread.cc
index 8ef190a..e85ef09 100644
--- a/runtime/native/java_lang_Thread.cc
+++ b/runtime/native/java_lang_Thread.cc
@@ -85,7 +85,7 @@
     case kSuspended:                      return kJavaRunnable;
     // Don't add a 'default' here so the compiler can spot incompatible enum changes.
   }
-  return -1; // Unreachable.
+  return -1;  // Unreachable.
 }
 
 static jboolean Thread_nativeHoldsLock(JNIEnv* env, jobject java_thread, jobject java_object) {