MAINTAINERS: mmc: Update Chris Ball's email address.

I'm no longer at OLPC.  (The old email address still works for now.)

Signed-off-by: Chris Ball <chris@printf.net>
diff --git a/MAINTAINERS b/MAINTAINERS
index 612bade..7cda615 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5712,7 +5712,7 @@
 F:	include/linux/mfd/
 
 MULTIMEDIA CARD (MMC), SECURE DIGITAL (SD) AND SDIO SUBSYSTEM
-M:	Chris Ball <cjb@laptop.org>
+M:	Chris Ball <chris@printf.net>
 L:	linux-mmc@vger.kernel.org
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc.git
 S:	Maintained
@@ -7478,7 +7478,7 @@
 F:	drivers/mmc/host/sdricoh_cs.c
 
 SECURE DIGITAL HOST CONTROLLER INTERFACE (SDHCI) DRIVER
-M:	Chris Ball <cjb@laptop.org>
+M:	Chris Ball <chris@printf.net>
 L:	linux-mmc@vger.kernel.org
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc.git
 S:	Maintained