new code..

	g_return_val_if_fail (bdaddr != NULL, NULL);
	g_return_val_if_fail (channel <= 0, NULL);

replaced code..

	if (! bdaddr) {
		g_warning ("Null bdaddr passed");
		return NULL;
	}

	if (channel <= 0) {
		g_warning ("Channel less than 1");
		return NULL;
	}