batman-adv: Update copyright years

Signed-off-by: Sven Eckelmann <sven@narfation.org>
diff --git a/net/batman-adv/gateway_common.h b/net/batman-adv/gateway_common.h
index 5e728d0..55e527a 100644
--- a/net/batman-adv/gateway_common.h
+++ b/net/batman-adv/gateway_common.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2009-2010 B.A.T.M.A.N. contributors:
+ * Copyright (C) 2009-2011 B.A.T.M.A.N. contributors:
  *
  * Marek Lindner
  *