smsc911x: make smsc911x_poll_controller static

Signed-off-by: Steve Glendinning <steve.glendinning@smsc.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/smsc911x.c

@@ -1526,7 +1526,7 @@ static irqreturn_t smsc911x_irqhandler(int irq, void *dev_id)
 }
 
 #ifdef CONFIG_NET_POLL_CONTROLLER
-void smsc911x_poll_controller(struct net_device *dev)
+static void smsc911x_poll_controller(struct net_device *dev)
 {
 	disable_irq(dev->irq);
 	smsc911x_irqhandler(0, dev);