util/CharUtil: fix indent

src/util/CharUtil.hxx

 /*
- * Copyright (C) 2011-2013 Max Kellermann <max@duempel.org>
+ * Copyright (C) 2011-2014 Max Kellermann <max@duempel.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -27,8 +27,8 @@
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef CHAR_UTIL_HPP
-#define CHAR_UTIL_HPP
+#ifndef CHAR_UTIL_HXX
+#define CHAR_UTIL_HXX
 
 constexpr
 static inline bool