block/blkdebug: remove new_state field and instead use a local variable

block/blkdebug: remove new_state field and instead use a local variable

There seems to be no benefit in using a field. Replace it with a local
variable, and move the state update before the yields.

The state update has do be done before the yields because now using
a local variable does not allow the new updated state to be visible
by the other yields.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Message-Id: <20210614082931.24925-6-eesposit@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>