ACPI: scan: Clean up after recent changes

Use LIST_HEAD() for initializing an on-stack list head in two places and
remove an empty code line added by mistake.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
Link: https://patch.msgid.link/12825056.O9o76ZdvQC@rafael.j.wysocki
2 files changed