block/blklogwrites: don't care to remove bs->file child on failure

We don't need to remove bs->file, generic layer takes care of it. No
other driver cares to remove bs->file on failure by hand.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20220726201134.924743-4-vsementsov@yandex-team.ru>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

block/blklogwrites.c

@@ -254,10 +254,6 @@ fail_log:
         s->log_file = NULL;
     }
 fail:
-    if (ret < 0) {
-        bdrv_unref_child(bs, bs->file);
-        bs->file = NULL;
-    }
     qemu_opts_del(opts);
     return ret;
 }