ath9k: add a patch to fix the interoperability issues with intel clients (fixes #8830)

SVN-Revision: 26036

package/mac80211/patches/590-ath9k_tid_cleanup_send_bar.patch

+--- a/drivers/net/wireless/ath/ath9k/xmit.c
++++ b/drivers/net/wireless/ath/ath9k/xmit.c
+@@ -166,7 +166,7 @@ static void ath_tx_flush_tid(struct ath_
+ 		fi = get_frame_info(bf->bf_mpdu);
+ 		if (fi->retries) {
+ 			ath_tx_update_baw(sc, tid, fi->seqno);
+-			ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0, 0);
++			ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0, 1);
+ 		} else {
+ 			ath_tx_send_normal(sc, txq, NULL, &bf_head);
+ 		}