BWFM_CHANSPEC_CHAN_MASK
chanspec = ieee80211_mhz2ieee(c->ic_freq, 0) & BWFM_CHANSPEC_CHAN_MASK;
chanspec = ieee80211_mhz2ieee(c->ic_freq, 0) & BWFM_CHANSPEC_CHAN_MASK;
chanidx = chanspec & BWFM_CHANSPEC_CHAN_MASK;
chanidx = chanspec & BWFM_CHANSPEC_CHAN_MASK;