ucom(4) did not understand the last-close semantics.  repair that, and add a bit more locking in the open function. originally spotted by matthew, ok matthew miod
ucom(4) did not understand the last-close semantics.  repair that, and
add a bit more locking in the open function.
originally spotted by matthew, ok matthew miod

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