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>
diff --git a/drivers/net/sb1000.c b/drivers/net/sb1000.c
index fc0e38b..6a81aec 100644
--- a/drivers/net/sb1000.c
+++ b/drivers/net/sb1000.c
@@ -1086,7 +1086,7 @@
 	printk(KERN_WARNING "%s: trying to transmit!!!\n", dev->name);
 	/* sb1000 can't xmit datagrams */
 	dev_kfree_skb(skb);
-	return 0;
+	return NETDEV_TX_OK;
 }
 
 /* SB1000 interrupt handler. */