 o check lseek return values  o better error messages on read failure  o use SEEK_SET, not 0 in lseek
 o check lseek return values
 o better error messages on read failure
 o use SEEK_SET, not 0 in lseek

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