zbd: don't unlock zone mutex after verify replay

zbd: don't unlock zone mutex after verify replay

zbd_adjust_block() always returns with the zone locked if the i/o is
accepted. The corresponding unlock happens in zbd_put_io(). The
function description says -

 * Locking strategy: returns with z->mutex locked if and only if z refers
 * to a sequential zone and if io_u_accept is returned. z is the zone that
 * corresponds to io_u->offset at the end of this function.

Remove the recently added unlock after zbd_replay_write_order() call.
Add a Coverity annotation to mark the absence of unlock as intentional.

Fixes: b2726d53bb5d ("zbd: Add a missing pthread_mutex_unlock() call")
Signed-off-by: Dmitry Fomichev <dmitry.fomichev@wdc.com>
Reviewed-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>