Fixing whitespace problems

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@111750 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/iosfwd b/include/iosfwd
index 32f679e..a4d3f38 100644
--- a/include/iosfwd
+++ b/include/iosfwd
@@ -158,7 +158,7 @@
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
 typedef fpos<mbstate_t>    u16streampos;
 typedef fpos<mbstate_t>    u32streampos;
-#endif
+#endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
 
 typedef long long streamoff;        // for char_traits in <string>