netdev: convert bulk of drivers to netdev_tx_t

In a couple of cases collapse some extra code like:
   int retval = NETDEV_TX_OK;
   ...
   return retval;
into
   return NETDEV_TX_OK;

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/eepro.c b/drivers/net/eepro.c
index 53317a8..1e93416 100644
--- a/drivers/net/eepro.c
+++ b/drivers/net/eepro.c
@@ -309,7 +309,8 @@
 
 static int	eepro_probe1(struct net_device *dev, int autoprobe);
 static int	eepro_open(struct net_device *dev);
-static int	eepro_send_packet(struct sk_buff *skb, struct net_device *dev);
+static netdev_tx_t eepro_send_packet(struct sk_buff *skb,
+				     struct net_device *dev);
 static irqreturn_t eepro_interrupt(int irq, void *dev_id);
 static void 	eepro_rx(struct net_device *dev);
 static void 	eepro_transmit_interrupt(struct net_device *dev);
@@ -1133,7 +1134,8 @@
 }
 
 
-static int eepro_send_packet(struct sk_buff *skb, struct net_device *dev)
+static netdev_tx_t eepro_send_packet(struct sk_buff *skb,
+				     struct net_device *dev)
 {
 	struct eepro_local *lp = netdev_priv(dev);
 	unsigned long flags;