This was another merge problem that wasn't a data conflict, but due to
independent changes in two branches that just didn't work together.
The pcc-acpi staging driver used
	acpi_driver_data(device) = hotkey;
to set driver data, but the ACPI merge made that invalid in commit
db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 ("ACPI: catch calls of
acpi_driver_data on pointer of wrong type"), and now you're supposed to
just do.
	device->driver_data = hotkey;
instead.
Fix it up.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 
        hotkey->device   = device;
        hotkey->handle   = device->handle;
        hotkey->num_sifr = num_sifr;
-       acpi_driver_data(device) = hotkey;
+       device->driver_data = hotkey;
        strcpy(acpi_device_name(device),  ACPI_PCC_DEVICE_NAME);
        strcpy(acpi_device_class(device), ACPI_PCC_CLASS);