Merge branch 'pci/hotplug'

- Pass empty string, not an uninitialized device_class string, to
  acpi_bus_generate_netlink_event(), so we can remove device_class
  completely in the future (Rafael J. Wysocki)

* pci/hotplug:
  PCI: acpiphp_ibm: Do not use uninitialized device_class

drivers/pci/hotplug/acpiphp_ibm.c

@@ -258,8 +258,7 @@ static void ibm_handle_events(acpi_handle handle, u32 event, void *context)
 
 	if (subevent == 0x80) {
 		pr_debug("%s: generating bus event\n", __func__);
-		acpi_bus_generate_netlink_event(note->device->pnp.device_class,
-						  dev_name(&note->device->dev),
+		acpi_bus_generate_netlink_event("", dev_name(&note->device->dev),
 						  note->event, detail);
 	} else
 		note->event = event;