MAINTAINERS: Add Fam Zheng as Null block driver maintainer

Signed-off-by: NFam Zheng <famz@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
Message-id: 1427852740-24315-4-git-send-email-famz@redhat.com
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

MAINTAINERS

@@ -1182,6 +1182,12 @@ S: Supported
 F: block/gluster.c
 T: git git://github.com/codyprime/qemu-kvm-jtc.git block
 
+Null Block Driver
+M: Fam Zheng <famz@redhat.com>
+L: qemu-block@nongnu.org
+S: Supported
+F: block/null.c
+
 Bootdevice
 M: Gonglei <arei.gonglei@huawei.com>
 S: Maintained