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/de620.c b/drivers/net/de620.c
index 55d2bb6..45794f6 100644
--- a/drivers/net/de620.c
+++ b/drivers/net/de620.c
@@ -542,7 +542,7 @@
 	dev->stats.tx_packets++;
 	spin_unlock_irqrestore(&de620_lock, flags);
 	dev_kfree_skb (skb);
-	return 0;
+	return NETDEV_TX_OK;
 }
 
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