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Use a type implementing Error instead of a string for errors. Error implements Display so can be easily converted to a String. This will allow libflashrom to be more easily integrated. BUG=b:230545739 BRANCH=None TEST=cargo test Change-Id: Id166053c7edfd07576e7823692cfa0ea4d438948 Signed-off-by: Evan Benn <evanbenn@chromium.org> Reviewed-on: https://review.coreboot.org/c/flashrom/+/65277 Reviewed-by: Peter Marheine <pmarheine@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>