update David Miller's old email address

Signed-off-by: Justin P. Mattock <justinmattock@gmail.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/arch/mips/mm/sc-ip22.c b/arch/mips/mm/sc-ip22.c
index 13adb57..a6bd11f 100644
--- a/arch/mips/mm/sc-ip22.c
+++ b/arch/mips/mm/sc-ip22.c
@@ -2,7 +2,7 @@
  * sc-ip22.c: Indy cache management functions.
  *
  * Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org),
- * derived from r4xx0.c by David S. Miller (dm@engr.sgi.com).
+ * derived from r4xx0.c by David S. Miller (davem@davemloft.net).
  */
 #include <linux/init.h>
 #include <linux/kernel.h>