MAINTAINERS: remove stale info for DEVICE-MAPPER

Signed-off-by: Mike Snitzer <snitzer@kernel.org>

MAINTAINERS

@@ -6050,10 +6050,8 @@ M:	Mikulas Patocka <mpatocka@redhat.com>
 M:	dm-devel@lists.linux.dev
 L:	dm-devel@lists.linux.dev
 S:	Maintained
-W:	http://sources.redhat.com/dm
 Q:	http://patchwork.kernel.org/project/dm-devel/list/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git
-T:	quilt http://people.redhat.com/agk/patches/linux/editing/
 F:	Documentation/admin-guide/device-mapper/
 F:	drivers/md/Kconfig
 F:	drivers/md/Makefile