ACPI / PCI: replace open-coded _DSM code with helper functions
Use helper functions to simplify _DSM related code in pci-label driver. Also enforce more strict checks on objects returned by _DSM method. Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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