ieee80211_add_htcap
frm = ieee80211_add_htcap(frm, ni);
frm = ieee80211_add_htcap(frm, vap->iv_bss);
frm = ieee80211_add_htcap(frm, ni);
uint8_t *ieee80211_add_htcap(uint8_t *, struct ieee80211_node *);
frm = ieee80211_add_htcap(frm, ni);
frm = ieee80211_add_htcap(frm, ni);
frm = ieee80211_add_htcap(frm, bss);
frm = ieee80211_add_htcap(frm, ni);