tag_unref
void tag_unref(struct pf_tags *, u_int16_t);
tag_unref(&pf_tags, tag);
tag_unref(&pf_qids, (u_int16_t)qid);
tag_unref(rule->rule_tag);
tag_unref(rule->rule_tagged);
void tag_unref(u_int16_t);