ipf_nat_rule_deref
ipf_nat_rule_deref(softc, (ipnat_t **)datap);
ipf_nat_rule_deref(softc, &ipsec->ipsc_rule);
ipf_nat_rule_deref(softc, &ipn);
ipf_nat_rule_deref(softc, &np);
ipf_nat_rule_deref(softc, &ipn);
ipf_nat_rule_deref(softc, &hm->hm_ipnat);
extern void ipf_nat_rule_deref(ipf_main_softc_t *, ipnat_t **);
ipf_nat_rule_deref(softc, &pptp->pptp_rule);
ipf_nat_rule_deref(softc, &rci->rcmd_rule);
ipf_nat_rule_deref(softc, &tftp->ti_rule);