ath9k: Remove bogus assert in ath_clone_txbuf()

oops, this one should be part of the original patch
"ath9k: downgrade assert in ath_clone_txbuf()"
Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -242,7 +242,6 @@ static struct ath_buf* ath_clone_txbuf(struct ath_softc *sc, struct ath_buf *bf)
 		spin_unlock_bh(&sc->tx.txbuflock);
 		return NULL;
 	}
-	ASSERT(!list_empty((&sc->tx.txbuf)));
 	tbf = list_first_entry(&sc->tx.txbuf, struct ath_buf, list);
 	list_del(&tbf->list);
 	spin_unlock_bh(&sc->tx.txbuflock);