add: if (gtx->priv->null_out == TRUE) return NULL;
context: load_audio_out_driver (GtkXine *gtx){	GConfClient *conf;	xine_ao_driver_t *ao_driver;	char *audio_driver_id;	conf = gconf_client_get_default ();	audio_driver_id = gconf_client_get_string (conf,			GCONF_PREFIX"audio_driver",			NULL);	/* No configuration, fallback to auto */	if (audio_driver_id == NULL || strcmp (audio_driver_id, "") == 0)		audio_driver_id = g_strdup ("auto");	/* We know how to handle null driver */	if (strcmp (audio_driver_id, "null") == 0)		return NULL;	/* auto probe */	if (strcmp (audio_driver_id, "auto") == 0)		return xine_open_audio_driver (gtx->priv->xine, NULL, NULL);	/* no autoprobe */	ao_driver = xine_open_audio_driver (gtx->priv->xine,			audio_driver_id, NULL);	/* if it failed without autoprobe, probe */	if (ao_driver == NULL)		ao_driver = xine_open_audio_driver (gtx->priv->xine,				NULL, NULL);	g_free (audio_driver_id);	return ao_driver;}