Fix cpplint whitespace/comments issues

Change-Id: Iae286862c85fb8fd8901eae1204cd6d271d69496
diff --git a/compiler/sea_ir/sea_node.h b/compiler/sea_ir/sea_node.h
index efc1b0d..5d28f8a 100644
--- a/compiler/sea_ir/sea_node.h
+++ b/compiler/sea_ir/sea_node.h
@@ -76,5 +76,5 @@
   // operators because that would lead to duplication of their unique ids.
   DISALLOW_COPY_AND_ASSIGN(SeaNode);
 };
-} // end namespace sea_ir
+}  // namespace sea_ir
 #endif  // ART_COMPILER_SEA_IR_SEA_NODE_H_