There is job resource leak in function mirror_start_job,
although bdrv_create_dirty_bitmap is unlikely failed.
Add block_job_release for each release when needed.
Signed-off-by: NTing Wang <kathy.wangting@huawei.com>
Reviewed-by: NJohn Snow <jsnow@redhat.com>
Message-id: 1435311455-56048-1-git-send-email-kathy.wangting@huawei.com
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>