rem: LOG(L_ERR, "free_result(): Invalid parameter\n");
add: LOG(L_ERR, "free_result: Invalid parameter\n");
context: int free_result(db_res_t* _r){	if (!_r) {		LOG(L_ERR, "free_result(): Invalid parameter\n");		return -1;	}	free_columns(_r);	free_rows(_r);	pkg_free(_r);	return 0;}