V4L/DVB: IR/mceusb: use the proper ir-core device unregister function

Was using input_unregister_device directly, instead of using
ir_input_unregister, which tears down a bunch of other things in
addition to eventually calling input_unregister_device.
Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/IR/mceusb.c

@@ -1021,7 +1021,7 @@ static void __devexit mceusb_dev_disconnect(struct usb_interface *intf)
 		return;
 
 	ir->usbdev = NULL;
-	input_unregister_device(ir->idev);
+	ir_input_unregister(ir->idev);
 	usb_kill_urb(ir->urb_in);
 	usb_free_urb(ir->urb_in);
 	usb_free_coherent(dev, ir->len_in, ir->buf_in, ir->dma_in);