net: lan78xx: remove set but not used variable 'event'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/net/usb/lan78xx.c:3995:6: warning:
 variable event set but not used [-Wunused-but-set-variable]

It is never used, so can be removed.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/usb/lan78xx.c

@@ -3992,9 +3992,6 @@ static int lan78xx_suspend(struct usb_interface *intf, pm_message_t message)
 	struct lan78xx_priv *pdata = (struct lan78xx_priv *)(dev->data[0]);
 	u32 buf;
 	int ret;
-	int event;
-
-	event = message.event;
 
 	if (!dev->suspend_count++) {
 		spin_lock_irq(&dev->txq.lock);