(svn r13411) -Codechange: remove the return value from the thread procs because it is never used.

src/saveload.cpp

@@ -1607,10 +1607,9 @@ static SaveOrLoadResult SaveFileToDisk(bool threaded)
 	}
 }
 
-static void * CDECL SaveFileToDiskThread(void *arg)
+static void SaveFileToDiskThread(void *arg)
 {
 	SaveFileToDisk(true);
-	return NULL;
 }
 
 void WaitTillSaved()