ACPI: scan: Rename label in acpi_scan_init()

Rename the "out" label in acpi_scan_init() to "unlock", which is
a better match for its purpose, and fix up its alignment.

No functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>