mac80211: rename AP variable num_sta_authorized to num_mcast_sta

It is only used to test for BSS multicast receivers.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 0abbef95..44001c7 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -306,7 +306,7 @@
 		}
 	} else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
 			    ieee80211_is_data(hdr->frame_control) &&
-			    !atomic_read(&tx->sdata->u.ap.num_sta_authorized))) {
+			    !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
 		/*
 		 * No associated STAs - no need to send multicast
 		 * frames.