batman-adv: Place kref_get for orig_node_vlan near use

It is hard to understand why the refcnt is increased when it isn't done
near the actual place the new reference is used. So using kref_get right
before the place which requires the reference and in the same function
helps to avoid accidental problems caused by incorrect reference counting.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>

net/batman-adv/originator.c

@@ -133,9 +133,9 @@ batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node,
 		goto out;
 
 	kref_init(&vlan->refcount);
-	kref_get(&vlan->refcount);
 	vlan->vid = vid;
 
+	kref_get(&vlan->refcount);
 	hlist_add_head_rcu(&vlan->list, &orig_node->vlan_list);
 
 out: