xen-blkback: repleace check kthread_should_stop() to remove_requested in xen_blkif_sc...

xen-blkback: repleace check kthread_should_stop() to remove_requested in xen_blkif_schedule() loop.

When backend state change to XenbusStateClosed, remove_requested will be set,
so repleace check kthread_should_stop() to remove_requested in
xen_blkif_schedule() loop.

Signed-off-by: Joe Jin <joe.jin@oracle.com>
Cc: Daniel Stodden <daniel.stodden@citrix.com>
Cc: Jens Axboe <jaxboe@fusionio.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Annie Li <annie.li@oracle.com>
Cc: Ian Campbell <Ian.Campbell@eu.citrix.com>
--
 drivers/block/xen-blkback/blkback.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>