[CONNECTOR]: Cleanup struct cn_queue_dev

Struct member netlink_groups is never used, and I don't see how it can
be useful.
Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/connector/cn_queue.c

@@ -146,7 +146,6 @@ struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *nls)
 	spin_lock_init(&dev->queue_lock);
 
 	dev->nls = nls;
-	dev->netlink_groups = 0;
 
 	dev->cn_queue = create_workqueue(dev->name);
 	if (!dev->cn_queue) {

include/linux/connector.h

@@ -112,7 +112,6 @@ struct cn_queue_dev {
 	struct list_head queue_list;
 	spinlock_t queue_lock;
 
-	int netlink_groups;
 	struct sock *nls;
 };