Revert previous.
Revert previous.

The standards gpds are jealous gods. kettenis@ and beck@ have shown
EROFS is the wrong thing to return. So revert to EACCES until a
better error code is decided on.

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