ieee80211_add_erp
frm = ieee80211_add_erp(frm, vap);
frm = ieee80211_add_erp(frm, vap);
(void) ieee80211_add_erp(bo->bo_erp, vap);
frm = ieee80211_add_erp(frm, ic);
frm = ieee80211_add_erp(frm, ic);
extern u_int8_t *ieee80211_add_erp(u_int8_t *, struct ieee80211com *);