ACPI: Always check if _PRW is present before trying to evaluate it
Before evaluating _PRW for devices that are reported as inactive or not present by their _STA control methods we should check if those methods are actually present (otherwise the evaulation of _PRW will obviously fail and a scary message will be printed unnecessarily). Reported-by: Andreas Mohr <andi@lisas.de> Reported-by: Maciej Rutecki <maciej.rutecki@gmail.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Len Brown <len.brown@intel.com>
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