findhtchan
c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U);
c = findhtchan(ic, chan,
c = findhtchan(ic, chan,
c = findhtchan(ic, chan, IEEE80211_CHAN_HT20);
c = findhtchan(ic, in->in_chan, IEEE80211_CHAN_HT20);