Function if

freebsd/net80211/ieee80211_hostap.c:2087–2090

					ath = frm;
#endif
				else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
					if (ishtcapoui(frm) && htcap == NULL)
						htcap = frm;
				}
				break;
			}
			frm += frm[1] + 2;