xfs: update MAINTAINERS

I am taking over as XFS maintainer from Dave Chinner[1], so update
contact information and git tree pointers.

[1] http://lkml.iu.edu/hypermail/linux/kernel/1612.1/04390.html

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

MAINTAINERS

@@ -13527,11 +13527,11 @@ F:	arch/x86/xen/*swiotlb*
 F:	drivers/xen/*swiotlb*
 
 XFS FILESYSTEM
-M:	Dave Chinner <david@fromorbit.com>
+M:	Darrick J. Wong <darrick.wong@oracle.com>
 M:	linux-xfs@vger.kernel.org
 L:	linux-xfs@vger.kernel.org
 W:	http://xfs.org/
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs.git
+T:	git git://git.kernel.org/pub/scm/fs/xfs/xfs-linux.git
 S:	Supported
 F:	Documentation/filesystems/xfs.txt
 F:	fs/xfs/