net: 7990: Fix use correct return type for ndo_start_xmit()

The method ndo_start_xmit() returns a value of type netdev_tx_t. Fix
the ndo function to use the correct type.
Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/amd/7990.c

@@ -536,7 +536,7 @@ void lance_tx_timeout(struct net_device *dev, unsigned int txqueue)
 }
 EXPORT_SYMBOL_GPL(lance_tx_timeout);
 
-int lance_start_xmit(struct sk_buff *skb, struct net_device *dev)
+netdev_tx_t lance_start_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct lance_private *lp = netdev_priv(dev);
 	volatile struct lance_init_block *ib = lp->init_block;

drivers/net/ethernet/amd/7990.h

@@ -241,7 +241,7 @@ struct lance_private {
 /* Now the prototypes we export */
 int lance_open(struct net_device *dev);
 int lance_close(struct net_device *dev);
-int lance_start_xmit(struct sk_buff *skb, struct net_device *dev);
+netdev_tx_t lance_start_xmit(struct sk_buff *skb, struct net_device *dev);
 void lance_set_multicast(struct net_device *dev);
 void lance_tx_timeout(struct net_device *dev, unsigned int txqueue);
 #ifdef CONFIG_NET_POLL_CONTROLLER