batman-adv: Use kzalloc rather than kmalloc followed by memset with 0

Signed-off-by: Sven Eckelmann <sven@narfation.org>
diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c
index 61605a0..6e03635 100644
--- a/net/batman-adv/gateway_client.c
+++ b/net/batman-adv/gateway_client.c
@@ -273,11 +273,10 @@
 	struct gw_node *gw_node;
 	int down, up;
 
-	gw_node = kmalloc(sizeof(struct gw_node), GFP_ATOMIC);
+	gw_node = kzalloc(sizeof(struct gw_node), GFP_ATOMIC);
 	if (!gw_node)
 		return;
 
-	memset(gw_node, 0, sizeof(struct gw_node));
 	INIT_HLIST_NODE(&gw_node->list);
 	gw_node->orig_node = orig_node;
 	atomic_set(&gw_node->refcount, 1);