batman-adv: update copyright years for 2014

Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
diff --git a/net/batman-adv/debugfs.h b/net/batman-adv/debugfs.h
index 981794f..37c4d6d 100644
--- a/net/batman-adv/debugfs.h
+++ b/net/batman-adv/debugfs.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2010-2013 B.A.T.M.A.N. contributors:
+/* Copyright (C) 2010-2014 B.A.T.M.A.N. contributors:
  *
  * Marek Lindner
  *