It's incorrect to return success rc >= 0 if we skip qio_channel_writev_all()
call due to s->quit.
Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Message-Id: <20170920124507.18841-4-vsementsov@virtuozzo.com>
Signed-off-by: NEric Blake <eblake@redhat.com>