mirror_top_bs must be removed from the graph again when creating the
dirty bitmap fails.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
 block/mirror.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/block/mirror.c b/block/mirror.c
index 001b5f0..f24dc51 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -1197,10 +1197,7 @@ static void mirror_start_job(const char *job_id, BlockDriverState *bs,
 
     s->dirty_bitmap = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp);
     if (!s->dirty_bitmap) {
-        g_free(s->replaces);
-        blk_unref(s->target);
-        block_job_unref(&s->common);
-        return;
+        goto fail;
     }
 
     /* Required permissions are already taken with blk_new() */
-- 
1.8.3.1