If img_compare() fails to parse the cache flags the goto out3 code path
will call qemu_progress_end(). Make sure we actually call
qemu_progress_init() first.
Reported-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com>