net: use NETDEV_TX_OK instead of 0 in ndo_start_xmit() functions

This patch is the result of an automatic spatch transformation to convert
all ndo_start_xmit() return values of 0 to NETDEV_TX_OK.

Some occurences are missed by the automatic conversion, those will be
handled in a seperate patch.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/lance.c

@@ -1016,7 +1016,7 @@ static int lance_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
 out:
 	spin_unlock_irqrestore(&lp->devlock, flags);
-	return 0;
+	return NETDEV_TX_OK;
 }
 
 /* The LANCE interrupt handler. */