Disallow swapping to vnd's and return ENOTSUPP back to userland.
Disallow swapping to vnd's and return ENOTSUPP back
to userland.

Wrap the checking code in #if NVND > 0 as pointed out
by miod.

ok beck@
ok deraadt@, krw@ (on an earlier diff)

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