netdev: convert pseudo drivers to netdev_tx_t

These are all drivers that don't touch real hardware.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 190f784..d1941cd 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -148,7 +148,7 @@
  * xmit
  */
 
-static int veth_xmit(struct sk_buff *skb, struct net_device *dev)
+static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct net_device *rcv = NULL;
 	struct veth_priv *priv, *rcv_priv;