The logic in this function is a little tricky (though correct).
The logic in this function is a little tricky (though correct).

Explain how an invaviant is satisfied and add an assertion to check
(never hit that one). As a side benefit clang doesn't bitch about a
possible NULL deref now.

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