caif: remove unneeded variable from caif_net_open()

We don't use the "ser" variable so I've removed it.
Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: Sjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/caif/caif_serial.c

@@ -410,8 +410,6 @@ static void caifdev_setup(struct net_device *dev)
 
 static int caif_net_open(struct net_device *dev)
 {
-	struct ser_device *ser;
-	ser = netdev_priv(dev);
 	netif_wake_queue(dev);
 	return 0;
 }