ACPI: battery: register power_supply subdevice only when battery is present
Make sure no power_supply object is present unless we actualy detect presence of battery. This fixes ghost batteries detected by HAL Signed-off-by: NAndrey Borzenkov <arvidjaar@mail.ru> Signed-off-by: NAlexey Starikovskiy <astarikovskiy@suse.de> Signed-off-by: NLen Brown <len.brown@intel.com>
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