MBUF_REFCNT
if (MBUF_REFCNT(m) != 1) {
nm_prerr("invalid refcnt %d for %p", MBUF_REFCNT(m), m);
} else if (MBUF_REFCNT(m) != 1) {
} else if (MBUF_REFCNT(m) != 1) {
nm_prdis("Request Event at %d mbuf %p refcnt %d", e, m, m ? MBUF_REFCNT(m) : -2 );