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/bmac.c

diff --git a/drivers/net/bmac.c b/drivers/net/bmac.c
index 9578a3d..4160001 100644
--- a/drivers/net/bmac.c
+++ b/drivers/net/bmac.c
@@ -1488,7 +1488,7 @@
 	struct bmac_data *bp = netdev_priv(dev);
 	skb_queue_tail(bp->queue, skb);
 	bmac_start(dev);
-	return 0;
+	return NETDEV_TX_OK;
 }
 
 static void bmac_tx_timeout(unsigned long data)