ath9k: fix clearing expired A-MPDU subframes in tx completion

When the tid aggregation state has been marked as inactive, free
completed tx packets immediately. When a new aggregation session has not
been initialized yet, the BAW checks do not recognize it as expired.

Might fix potential stalls in setting up a new aggregation session.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index e69f7fe..3ede3e9 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -520,7 +520,8 @@
 		tx_info = IEEE80211_SKB_CB(skb);
 		fi = get_frame_info(skb);
 
-		if (!BAW_WITHIN(tid->seq_start, tid->baw_size, seqno)) {
+		if (!BAW_WITHIN(tid->seq_start, tid->baw_size, seqno) ||
+		    !tid->active) {
 			/*
 			 * Outside of the current BlockAck window,
 			 * maybe part of a previous session