lan78xx: mark symbols static where possible

We get a few warnings when building kernel with W=1:
drivers/net/usb/lan78xx.c:1182:6: warning: no previous prototype for 'lan78xx_defer_kevent' [-Wmissing-prototypes]
drivers/net/usb/lan78xx.c:1409:5: warning: no previous prototype for 'lan78xx_nway_reset' [-Wmissing-prototypes]
drivers/net/usb/lan78xx.c:2000:5: warning: no previous prototype for 'lan78xx_set_mac_addr' [-Wmissing-prototypes]
....

In fact, these functions are only used in the file in which they are
declared and don't need a declaration, but can be made static.
so this patch marks these functions with 'static'.
Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/usb/lan78xx.c

@@ -1179,7 +1179,7 @@ static int lan78xx_link_reset(struct lan78xx_net *dev)
  * NOTE:  annoying asymmetry:  if it's active, schedule_work() fails,
  * but tasklet_schedule() doesn't.	hope the failure is rare.
  */
-void lan78xx_defer_kevent(struct lan78xx_net *dev, int work)
+static void lan78xx_defer_kevent(struct lan78xx_net *dev, int work)
 {
 	set_bit(work, &dev->flags);
 	if (!schedule_delayed_work(&dev->wq, 0))
@@ -1406,7 +1406,7 @@ static u32 lan78xx_get_link(struct net_device *net)
 	return net->phydev->link;
 }
 
-int lan78xx_nway_reset(struct net_device *net)
+static int lan78xx_nway_reset(struct net_device *net)
 {
 	return phy_start_aneg(net->phydev);
 }
@@ -1997,7 +1997,7 @@ static int lan78xx_change_mtu(struct net_device *netdev, int new_mtu)
 	return 0;
 }
 
-int lan78xx_set_mac_addr(struct net_device *netdev, void *p)
+static int lan78xx_set_mac_addr(struct net_device *netdev, void *p)
 {
 	struct lan78xx_net *dev = netdev_priv(netdev);
 	struct sockaddr *addr = p;
@@ -2371,7 +2371,7 @@ static void lan78xx_terminate_urbs(struct lan78xx_net *dev)
 	remove_wait_queue(&unlink_wakeup, &wait);
 }
 
-int lan78xx_stop(struct net_device *net)
+static int lan78xx_stop(struct net_device *net)
 {
 	struct lan78xx_net		*dev = netdev_priv(net);
 
@@ -2533,7 +2533,8 @@ static void lan78xx_queue_skb(struct sk_buff_head *list,
 	entry->state = state;
 }
 
-netdev_tx_t lan78xx_start_xmit(struct sk_buff *skb, struct net_device *net)
+static netdev_tx_t
+lan78xx_start_xmit(struct sk_buff *skb, struct net_device *net)
 {
 	struct lan78xx_net *dev = netdev_priv(net);
 	struct sk_buff *skb2 = NULL;
@@ -2562,7 +2563,8 @@ netdev_tx_t lan78xx_start_xmit(struct sk_buff *skb, struct net_device *net)
 	return NETDEV_TX_OK;
 }
 
-int lan78xx_get_endpoints(struct lan78xx_net *dev, struct usb_interface *intf)
+static int
+lan78xx_get_endpoints(struct lan78xx_net *dev, struct usb_interface *intf)
 {
 	int tmp;
 	struct usb_host_interface *alt = NULL;
@@ -2700,7 +2702,7 @@ static void lan78xx_rx_csum_offload(struct lan78xx_net *dev,
 	}
 }
 
-void lan78xx_skb_return(struct lan78xx_net *dev, struct sk_buff *skb)
+static void lan78xx_skb_return(struct lan78xx_net *dev, struct sk_buff *skb)
 {
 	int		status;
 
@@ -3283,7 +3285,7 @@ static void lan78xx_disconnect(struct usb_interface *intf)
 	usb_put_dev(udev);
 }
 
-void lan78xx_tx_timeout(struct net_device *net)
+static void lan78xx_tx_timeout(struct net_device *net)
 {
 	struct lan78xx_net *dev = netdev_priv(net);
 
@@ -3603,7 +3605,7 @@ static int lan78xx_set_suspend(struct lan78xx_net *dev, u32 wol)
 	return 0;
 }
 
-int lan78xx_suspend(struct usb_interface *intf, pm_message_t message)
+static int lan78xx_suspend(struct usb_interface *intf, pm_message_t message)
 {
 	struct lan78xx_net *dev = usb_get_intfdata(intf);
 	struct lan78xx_priv *pdata = (struct lan78xx_priv *)(dev->data[0]);
@@ -3699,7 +3701,7 @@ int lan78xx_suspend(struct usb_interface *intf, pm_message_t message)
 	return ret;
 }
 
-int lan78xx_resume(struct usb_interface *intf)
+static int lan78xx_resume(struct usb_interface *intf)
 {
 	struct lan78xx_net *dev = usb_get_intfdata(intf);
 	struct sk_buff *skb;
@@ -3766,7 +3768,7 @@ int lan78xx_resume(struct usb_interface *intf)
 	return 0;
 }
 
-int lan78xx_reset_resume(struct usb_interface *intf)
+static int lan78xx_reset_resume(struct usb_interface *intf)
 {
 	struct lan78xx_net *dev = usb_get_intfdata(intf);