batman-adv: Prefix vis defines with BATADV_

Reported-by: Martin Hundebøll <martin@hundeboll.net>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
diff --git a/net/batman-adv/vis.c b/net/batman-adv/vis.c
index 596eacc..a439ed6 100644
--- a/net/batman-adv/vis.c
+++ b/net/batman-adv/vis.c
@@ -674,7 +674,7 @@
 				continue;
 
 			if (batadv_has_timed_out(info->first_seen,
-						 VIS_TIMEOUT)) {
+						 BATADV_VIS_TIMEOUT)) {
 				hlist_del(node);
 				batadv_send_list_del(info);
 				kref_put(&info->refcount, batadv_free_info);