mac80211: uAPSD - fix IEEE80211_FCTL_MOREDATA bit setting

Set IEEE80211_FCTL_MOREDATA bit also in case we have buffered
frames (more than one) only for one AC.

Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index ce962d2..8eaa746 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -1354,12 +1354,12 @@
 			 * Use MoreData flag to indicate whether there are
 			 * more buffered frames for this STA
 			 */
-			if (!more_data)
-				hdr->frame_control &=
-					cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
-			else
+			if (more_data || !skb_queue_empty(&frames))
 				hdr->frame_control |=
 					cpu_to_le16(IEEE80211_FCTL_MOREDATA);
+			else
+				hdr->frame_control &=
+					cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
 
 			if (ieee80211_is_data_qos(hdr->frame_control) ||
 			    ieee80211_is_qos_nullfunc(hdr->frame_control))