forgot return value on windows

can't check it though


git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@445 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Core/Common/Src/FileUtil.cpp

@@ -103,7 +103,8 @@ bool File::CreateDir(const std::string &path)
 
 std::string GetUserDirectory() {
 #ifdef _WIN32 
-  //TODO #endif
+  //TODO 
+  return std::string("");
 #else
   char *dir = getenv("HOME");
   if (!dir)