check_GROUP(const struct ofpact_group *a OVS_UNUSED,
            const struct ofpact_check_params *cp OVS_UNUSED)
{
    return 0;
}
check_GROUP(const struct ofpact_group *a OVS_UNUSED,
            const struct ofpact_check_params *cp OVS_UNUSED)
{
    return 0;
}