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/misc/sgi-xp/xpnet.c b/drivers/misc/sgi-xp/xpnet.c
index 8d1c60a..b681bf8 100644
--- a/drivers/misc/sgi-xp/xpnet.c
+++ b/drivers/misc/sgi-xp/xpnet.c
@@ -436,7 +436,7 @@
 
 	if (skb->data[0] == 0x33) {
 		dev_kfree_skb(skb);
-		return 0;	/* nothing needed to be done */
+		return NETDEV_TX_OK;	/* nothing needed to be done */
 	}
 
 	/*
@@ -503,7 +503,7 @@
 	dev->stats.tx_packets++;
 	dev->stats.tx_bytes += skb->len;
 
-	return 0;
+	return NETDEV_TX_OK;
 }
 
 /*