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Only call init_zfs_bootenv() when the system was booted with ZFS

Description

Only call init_zfs_bootenv() when the system was booted with ZFS

Add a few other safeguards to ensure things do not break when the
boot device cannot be determined

Reported by: flo
MFC after: 3 days
Sponsored by: ScaleEngine Inc.

Details

Provenance
allanjudeAuthored on
Parents
rS293453: Regen after r293450
Branches
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