make {f,}chflags(.., -1) return EINVAL because -1 is VNOVAL; problem noted by provos
make {f,}chflags(.., -1) return EINVAL because -1 is VNOVAL; problem noted by provos

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