add: if (gtx->priv->mrl == NULL) return 0;
context: gtk_xine_get_stream_length (GtkXine *gtx){	int length_time = 0;	int pos_stream, pos_time;	g_return_val_if_fail (gtx != NULL, 0);	g_return_val_if_fail (GTK_IS_XINE (gtx), 0);	g_return_val_if_fail (gtx->priv->xine != NULL, 0);	xine_get_pos_length (gtx->priv->stream, &pos_stream,			&pos_time, &length_time);	return length_time;}