Silence ``invalid NVRAM header'' message if the NVRAM header is three zero bytes (as encountered on sgi). ok krw@ deraadt@
Silence ``invalid NVRAM header'' message if the NVRAM header is three zero
bytes (as encountered on sgi).
ok krw@ deraadt@

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