Prevent a panic by validating the super block size as recorded in the superblock; make the block size check also catch negative values. ok miller@ tedu@
Prevent a panic by validating the super block size as recorded in the
superblock; make the block size check also catch negative values.
ok miller@ tedu@

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