net-sysfs: Call dev_hold always in netdev_queue_add_kobject

Dev_hold has to be called always in netdev_queue_add_kobject.
Otherwise usage count drops below 0 in case of failure in
kobject_init_and_add.

Fixes: b8eb718348b8 ("net-sysfs: Fix reference count leak in rx|netdev_queue_add_kobject")
Reported-by: Hulk Robot <[e-mail]>
Cc: Tetsuo Handa <[e-mail]>
Cc: David Miller <[e-mail]>
Cc: Lukas Bulwahn <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/core/net-sysfs.c

···
 	struct kobject *kobj = &queue->kobj;
 	int error = 0;
 
+	/* Kobject_put later will trigger netdev_queue_release call
+	 * which decreases dev refcount: Take that reference here
+	 */
+	dev_hold(queue->dev);
+
 	kobj->kset = dev->queues_kset;
 	error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
 				     "tx-%u", index);
 	if (error)
 		goto err;
-
-	dev_hold(queue->dev);
 
 #ifdef CONFIG_BQL
 	error = sysfs_create_group(kobj, &dql_group);