MAINTAINERS: pass on hwpoison maintainership to Naoya Horiguchi

Horiguchi-san has done most of the work on hwpoison in the last years
and he also does most of the reviewing.  So I'm passing on the hwpoison
maintainership to him.
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -4011,9 +4011,8 @@ S:	Odd Fixes
 F:	drivers/media/usb/hdpvr/
 
 HWPOISON MEMORY FAILURE HANDLING
-M:	Andi Kleen <andi@firstfloor.org>
+M:	Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
 L:	linux-mm@kvack.org
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6.git hwpoison
 S:	Maintained
 F:	mm/memory-failure.c
 F:	mm/hwpoison-inject.c