batman-adv: add blank line between declarations and the rest of the code

Reported by checkpatch with the following message:
"WARNING: Missing a blank line after declarations"

Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
diff --git a/net/batman-adv/network-coding.c b/net/batman-adv/network-coding.c
index a9546fe..40a2fc4 100644
--- a/net/batman-adv/network-coding.c
+++ b/net/batman-adv/network-coding.c
@@ -86,6 +86,7 @@
 void batadv_nc_status_update(struct net_device *net_dev)
 {
 	struct batadv_priv *bat_priv = netdev_priv(net_dev);
+
 	batadv_nc_tvlv_container_update(bat_priv);
 }