MBUF_LIST_FIRST
m = MBUF_LIST_FIRST(&glom);
m = MBUF_LIST_FIRST(&cd->q);
return MBUF_LIST_FIRST(&cq->q);
m0 = MBUF_LIST_FIRST(&cl->cl_q.q);
enqueue_randomness(ml_len(ml) ^ (uintptr_t)MBUF_LIST_FIRST(ml));
KASSERT(MBUF_LIST_FIRST(pl) == m);
m = MBUF_LIST_FIRST(pl);
for ((_m) = MBUF_LIST_FIRST(_ml); \