ieee80211_mbuf_adjust
m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m);
struct mbuf *ieee80211_mbuf_adjust(struct ieee80211vap *, int,
m1 = ieee80211_mbuf_adjust(vap, hdrspace, key, m1);
m2 = ieee80211_mbuf_adjust(vap, 4, NULL, m2);
m1 = ieee80211_mbuf_adjust(vap,
m2 = ieee80211_mbuf_adjust(vap, 4, NULL, m2);