batman-adv: update copyright years for 2015

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
diff --git a/net/batman-adv/bridge_loop_avoidance.c b/net/batman-adv/bridge_loop_avoidance.c
index ac4b96e..fa941cd 100644
--- a/net/batman-adv/bridge_loop_avoidance.c
+++ b/net/batman-adv/bridge_loop_avoidance.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2011-2014 B.A.T.M.A.N. contributors:
+/* Copyright (C) 2011-2015 B.A.T.M.A.N. contributors:
  *
  * Simon Wunderlich
  *