(svn r2651) - Fix: [ 1220776 ] Removes warning when compiling saveload.c on some GCC versions (glx). This only works as long as there is only 1 saving thread active, as is the case now.

saveload.c

@@ -1235,9 +1235,11 @@ static bool SaveFileToDisk(void *ptr)
 	const SaveLoadFormat *fmt = GetSavegameFormat(_savegame_format);
 	/* XXX - backup _sl.buf cause it is used internally by the writer
 	 * and we update it for our own purposes */
-	byte *tmp = _sl.buf;
+	static byte *tmp = NULL;
 	uint32 hdr[2];
 
+	tmp = _sl.buf;
+
 	SaveFileStart();
 
 	/* XXX - Setup setjmp error handler if an error occurs anywhere deep during