imp f7706a11d9 Refactor currdev setting
Refactor the currdev setting to find the device we booted from. Limit
searching when we don't already have a reasonable currdev from that to
the same device only. Search a little harder for ZFS volumes as that's
needed for loader.efi to live on an ESP.

Sponsored by: Netflix
Differential Review: https://reviews.freebsd.org/D13784
2018-04-11 19:46:24 +00:00
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