STAILQ_LAST
STAILQ_LAST(&dbch->db_trq, fwohcidb_tr,link)->link.stqe_next
prev = STAILQ_LAST(&it->stdma, fw_bulkxfer, link);
prev = STAILQ_LAST(&ir->stdma, fw_bulkxfer, link);
return (STAILQ_LAST(&mq->mq_head, mbuf, m_stailqpkt));
prev = STAILQ_LAST(&queue->tq_queue, task, ta_link);