Dimitry Andric:  Silence some miscellaneous warnings.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@167493 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/ext/__hash b/include/ext/__hash
index 8e9635d..21500e8 100644
--- a/include/ext/__hash
+++ b/include/ext/__hash
@@ -43,4 +43,4 @@
 };
 }
 
-#endif _LIBCPP_EXT_HASH
+#endif  // _LIBCPP_EXT_HASH