IEEE80211_HTCAP_SGI20
ic->ic_htcaps = IEEE80211_HTCAP_SGI20 | IEEE80211_HTCAP_SGI40;
ic->ic_htcaps = IEEE80211_HTCAP_SGI20 | IEEE80211_HTCAP_SGI40;
(ni->ni_htcaps & IEEE80211_HTCAP_SGI20);
(ic->ic_htcaps & IEEE80211_HTCAP_SGI20))