PCI: PM: Simplify acpi_pci_power_manageable()

Make acpi_pci_power_manageable() more straightforward.

No functional impact.
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: NFerry Toth <fntoth@gmail.com>

drivers/pci/pci-acpi.c

@@ -972,9 +972,7 @@ bool acpi_pci_power_manageable(struct pci_dev *dev)
 {
 	struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
 
-	if (!adev)
-		return false;
-	return acpi_device_power_manageable(adev);
+	return adev && acpi_device_power_manageable(adev);
 }
 
 bool acpi_pci_bridge_d3(struct pci_dev *dev)