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/epic100.c

@@ -970,7 +970,7 @@ static int epic_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	unsigned long flags;
 
 	if (skb_padto(skb, ETH_ZLEN))
-		return 0;
+		return NETDEV_TX_OK;
 
 	/* Caution: the write order is important here, set the field with the
 	   "ownership" bit last. */
@@ -1014,7 +1014,7 @@ static int epic_start_xmit(struct sk_buff *skb, struct net_device *dev)
 			   dev->name, (int)skb->len, entry, ctrl_word,
 			   (int)inl(dev->base_addr + TxSTAT));
 
-	return 0;
+	return NETDEV_TX_OK;
 }
 
 static void epic_tx_error(struct net_device *dev, struct epic_private *ep,