Fix off-by-one. From FreeBSD r1.87. Also in NetBSD. Field being filled (sk_vpd_readonly) is not currently used, but the memory being tromped on might be.
Fix off-by-one. From FreeBSD r1.87. Also in NetBSD. Field being filled
(sk_vpd_readonly) is not currently used, but the memory being tromped
on might be.

ok millert@.

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