mac80211: fix wrong Rx A-MPDU control via debugfs

This patch eliminate the use of buf_size as a trigger in favor of a new
flag to control Rx A-MPDU sessions through debugfs

Signed-off-by: Ron Rindjunsky <ron.rindjunsky@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h
index f166c80..5d6b436 100644
--- a/net/mac80211/sta_info.h
+++ b/net/mac80211/sta_info.h
@@ -63,6 +63,7 @@
 #define HT_AGG_STATE_OPERATIONAL	(HT_ADDBA_REQUESTED_MSK |	\
 					 HT_ADDBA_DRV_READY_MSK |	\
 					 HT_ADDBA_RECEIVED_MSK)
+#define HT_AGG_STATE_DEBUGFS_CTL	BIT(7)
 
 /**
  * struct tid_ampdu_tx - TID aggregation information (Tx).