MAINTAINERS: Update email address for Robert Richter

Signed-off-by: Robert Richter <rric@kernel.org>
Signed-off-by: Andreas Herrmann <herrmann.der.user@googlemail.com>
Cc: lm-sensors@lm-sensors.org
Cc: oprofile-list@lists.sf.net
Cc: Stephane Eranian <eranian@google.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: =?iso-8859-1?Q?J=F6rg_R=F6del?= <joro@8bytes.org>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Link: http://lkml.kernel.org/r/20121029175325.GE5024@tweety


Signed-off-by: Ingo Molnar <mingo@kernel.org>