ieee80211_ra_vht_best_mcs_in_rateset
best_mcs = ieee80211_ra_vht_best_mcs_in_rateset(rn, rs);
ni->ni_txmcs = ieee80211_ra_vht_best_mcs_in_rateset(rn, rsnext);
int ieee80211_ra_vht_best_mcs_in_rateset(struct ieee80211_ra_vht_node *,
best_mcs = ieee80211_ra_vht_best_mcs_in_rateset(rn, rs);