Update copyright dates to include 2012.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@12843 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/exp-sgcheck/h_main.c b/exp-sgcheck/h_main.c
index c5801b9..8307145 100644
--- a/exp-sgcheck/h_main.c
+++ b/exp-sgcheck/h_main.c
@@ -11,12 +11,12 @@
 
    Initial version (Annelid):
 
-   Copyright (C) 2003-2011 Nicholas Nethercote
+   Copyright (C) 2003-2012 Nicholas Nethercote
       njn@valgrind.org
 
    Valgrind-3.X port:
 
-   Copyright (C) 2008-2011 OpenWorks Ltd
+   Copyright (C) 2008-2012 OpenWorks Ltd
       info@open-works.co.uk
 
    This program is free software; you can redistribute it and/or