Revert "ucc_geth: returns NETDEV_TX_BUSY when BD ring is full"

This reverts commit 18babd38.

Michael Barkowski points out that it's wrong, and I agree.  The
patch causes a problem rather than fixes one after another
patch "ucc_geth: Fix BD processing" was applied.  Before that
patch, current packet should be blocked.  However after the patch
current packet is ok and we only need to block next.
Reported-by: Michael Barkowski <michael.barkowski@freescale.com>
Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/ucc_geth.c

@@ -3607,7 +3607,6 @@ static int ucc_geth_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	if (bd == ugeth->confBd[txQ]) {
 		if (!netif_queue_stopped(dev))
 			netif_stop_queue(dev);
-		return NETDEV_TX_BUSY;
 	}
 
 	ugeth->txBd[txQ] = bd;
@@ -3623,7 +3622,7 @@ static int ucc_geth_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	spin_unlock_irq(&ugeth->lock);
 
-	return NETDEV_TX_OK;
+	return 0;
 }
 
 static int ucc_geth_rx(struct ucc_geth_private *ugeth, u8 rxQ, int rx_work_limit)