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/cassini.c b/drivers/net/cassini.c
index eb06667..299a33b 100644
--- a/drivers/net/cassini.c
+++ b/drivers/net/cassini.c
@@ -2928,7 +2928,7 @@
 	static int ring;
 
 	if (skb_padto(skb, cp->min_frame_size))
-		return 0;
+		return NETDEV_TX_OK;
 
 	/* XXX: we need some higher-level QoS hooks to steer packets to
 	 *      individual queues.
@@ -2936,7 +2936,7 @@
 	if (cas_xmit_tx_ringN(cp, ring++ & N_TX_RINGS_MASK, skb))
 		return NETDEV_TX_BUSY;
 	dev->trans_start = jiffies;
-	return 0;
+	return NETDEV_TX_OK;
 }
 
 static void cas_init_tx_dma(struct cas *cp)