b43: Do not return TX_BUSY from op_tx

Never return TX_BUSY from op_tx. It doesn't make sense to return
TX_BUSY, if we can not transmit the packet.
Drop the packet and return TX_OK.
This will fix the resume hang.
Signed-off-by: NMichael Buesch <mb@bu3sch.de>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/b43/main.c

@@ -2883,12 +2883,11 @@ static int b43_op_tx(struct ieee80211_hw *hw,
 
 	if (unlikely(skb->len < 2 + 2 + 6)) {
 		/* Too short, this can't be a valid frame. */
-		dev_kfree_skb_any(skb);
-		return NETDEV_TX_OK;
+		goto drop_packet;
 	}
 	B43_WARN_ON(skb_shinfo(skb)->nr_frags);
 	if (unlikely(!dev))
-		return NETDEV_TX_BUSY;
+		goto drop_packet;
 
 	/* Transmissions on seperate queues can run concurrently. */
 	read_lock_irqsave(&wl->tx_lock, flags);
@@ -2904,7 +2903,12 @@ static int b43_op_tx(struct ieee80211_hw *hw,
 	read_unlock_irqrestore(&wl->tx_lock, flags);
 
 	if (unlikely(err))
-		return NETDEV_TX_BUSY;
+		goto drop_packet;
+	return NETDEV_TX_OK;
+
+drop_packet:
+	/* We can not transmit this packet. Drop it. */
+	dev_kfree_skb_any(skb);
 	return NETDEV_TX_OK;
 }