batman-adv: Prefix hash non-static functions with batadv_

batman-adv can be compiled as part of the kernel instead of an module. In that
case the linker will see all non-static symbols of batman-adv and all other
non-static symbols of the kernel. This could lead to symbol collisions. A
prefix for the batman-adv symbols that defines their private namespace avoids
such a problem.

Reported-by: David Miller <davem@davemloft.net>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
diff --git a/net/batman-adv/vis.c b/net/batman-adv/vis.c
index 01d5da5..99f1931 100644
--- a/net/batman-adv/vis.c
+++ b/net/batman-adv/vis.c
@@ -889,7 +889,7 @@
 
 	spin_lock_bh(&bat_priv->vis_hash_lock);
 
-	bat_priv->vis_hash = hash_new(256);
+	bat_priv->vis_hash = batadv_hash_new(256);
 	if (!bat_priv->vis_hash) {
 		pr_err("Can't initialize vis_hash\n");
 		goto err;