ath9k: Fix TX poll work locking

There is no need to call ath_txq_unlock_complete() in the
TX poll routine - frame completion is not done here,
so use ath_txq_unlock().
Signed-off-by: NSujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/link.c

@@ -41,7 +41,7 @@ void ath_tx_complete_poll_work(struct work_struct *work)
 				txq->axq_tx_inprogress = true;
 			}
 		}
-		ath_txq_unlock_complete(sc, txq);
+		ath_txq_unlock(sc, txq);
 	}
 
 	if (needreset) {