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/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 7c0e0bd..a7e731f 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -4450,7 +4450,7 @@
 	}
 }
 
-static int bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
+static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	const struct bonding *bond = netdev_priv(dev);