check_SAMPLE(const struct ofpact_sample *a OVS_UNUSED,
             const struct ofpact_check_params *cp OVS_UNUSED)
{
    return 0;
}
check_SAMPLE(const struct ofpact_sample *a OVS_UNUSED,
             const struct ofpact_check_params *cp OVS_UNUSED)
{
    return 0;
}