Fixing whitespace problems

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@111750 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/mutex b/include/mutex
index 71a21e3..ac8ca2b 100644
--- a/include/mutex
+++ b/include/mutex
@@ -330,7 +330,7 @@
     return __r;
 }
 
-#endif
+#endif  // _LIBCPP_HAS_NO_VARIADICS
 
 template <class _L0, class _L1>
 void
@@ -413,7 +413,7 @@
     __lock_first(0, __l0, __l1, __l2...);
 }
 
-#endif
+#endif  // _LIBCPP_HAS_NO_VARIADICS
 
 struct once_flag;
 
@@ -422,12 +422,12 @@
 template<class _Callable, class... _Args>
   void call_once(once_flag&, _Callable&&, _Args&&...);
 
-#else
+#else  // _LIBCPP_HAS_NO_VARIADICS
 
 template<class _Callable>
   void call_once(once_flag&, _Callable);
 
-#endif
+#endif  // _LIBCPP_HAS_NO_VARIADICS
 
 struct once_flag
 {
@@ -444,11 +444,11 @@
     template<class _Callable, class... _Args>
     friend
     void call_once(once_flag&, _Callable&&, _Args&&...);
-#else
+#else  // _LIBCPP_HAS_NO_VARIADICS
     template<class _Callable>
     friend
     void call_once(once_flag&, _Callable);
-#endif
+#endif  // _LIBCPP_HAS_NO_VARIADICS
 };
 
 template <class _F>
@@ -495,7 +495,7 @@
     }
 }
 
-#else
+#else  // _LIBCPP_HAS_NO_VARIADICS
 
 template<class _Callable>
 inline _LIBCPP_INLINE_VISIBILITY
@@ -509,7 +509,7 @@
     }
 }
 
-#endif
+#endif  // _LIBCPP_HAS_NO_VARIADICS
 
 _LIBCPP_END_NAMESPACE_STD