fix Christoph's email addresses

There are various email addresses for me throughout the kernel.  Use the
one that will always be valid.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
index 5fbdd36..f4259e4 100644
--- a/mm/mmu_notifier.c
+++ b/mm/mmu_notifier.c
@@ -3,7 +3,7 @@
  *
  *  Copyright (C) 2008  Qumranet, Inc.
  *  Copyright (C) 2008  SGI
- *             Christoph Lameter <clameter@sgi.com>
+ *             Christoph Lameter <cl@linux.com>
  *
  *  This work is licensed under the terms of the GNU GPL, version 2. See
  *  the COPYING file in the top-level directory.