helper: clean up rw helper's return values.
helper: clean up rw helper's return values.

SuperTux88/sbcelt,mumble-voip/sbcelt,mkrautz/sbcelt,SuperTux88/sbcelt,mkrautz/sbcelt,mumble-voip/sbcelt,mkrautz/sbcelt,mkrautz/sbcelt,SuperTux88/sbcelt,mumble-voip/sbcelt,SuperTux88/sbcelt,mumble-voip/sbcelt