Don't forget to decrement a number of clusters on the ring in case of an error.  Previous change made the problem evident.
Don't forget to decrement a number of clusters on the ring in case
of an error.  Previous change made the problem evident.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars