ieee80211_add_xrates
static uint8_t *ieee80211_add_xrates(uint8_t *,
frm = ieee80211_add_xrates(frm, rs);
frm = ieee80211_add_xrates(frm, &ic->ic_sup_rates[mode]);
frm = ieee80211_add_xrates(frm, &in->in_rates);
frm = ieee80211_add_xrates(frm, &in->in_rates);
frm = ieee80211_add_xrates(frm, &in->in_rates);
frm = ieee80211_add_xrates(frm, rs);