ieee80211_chandef_num_subchans
if (!ieee80211_chandef_num_subchans(ap) ||
!ieee80211_chandef_num_subchans(used)) {
int n = ieee80211_chandef_num_subchans(ap);
while (ieee80211_chandef_num_subchans(&tmp) > n_partial_subchans) {
offset += ieee80211_chandef_num_subchans(&tmp);
u8 needed = ieee80211_chandef_num_subchans(used);
u8 have = ieee80211_chandef_num_subchans(ap);