vrf: drop unused num_slaves member

slave_queue has a num_slaves member which is unused, drop it.
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/vrf.c

@@ -335,13 +335,11 @@ static struct slave *__vrf_find_slave_dev(struct slave_queue *queue,
 static void __vrf_remove_slave(struct slave_queue *queue, struct slave *slave)
 {
 	list_del(&slave->list);
-	queue->num_slaves--;
 }
 
 static void __vrf_insert_slave(struct slave_queue *queue, struct slave *slave)
 {
 	list_add(&slave->list, &queue->all_slaves);
-	queue->num_slaves++;
 }
 
 static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev)

include/net/vrf.h

@@ -24,7 +24,6 @@ struct slave {
 
 struct slave_queue {
 	struct list_head	all_slaves;
-	int			num_slaves;
 };
 
 struct net_vrf {