staging: comedi: cleanup_device() -> comedi_device_detach_cleanup()

Rename the local function `cleanup_device()` to
`comedi_device_detach_cleanup()`.  It is only called from the
`comedi_device_detach()` function and that is called from
`comedi_device_cleanup()` and other places.  The more specific function
name seems less confusing.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers.c

@@ -95,7 +95,7 @@ int comedi_alloc_subdevices(struct comedi_device *dev, int num_subdevices)
 }
 EXPORT_SYMBOL_GPL(comedi_alloc_subdevices);
 
-static void cleanup_device(struct comedi_device *dev)
+static void comedi_device_detach_cleanup(struct comedi_device *dev)
 {
 	int i;
 	struct comedi_subdevice *s;
@@ -137,7 +137,7 @@ void comedi_device_detach(struct comedi_device *dev)
 	dev->attached = false;
 	if (dev->driver)
 		dev->driver->detach(dev);
-	cleanup_device(dev);
+	comedi_device_detach_cleanup(dev);
 	up_write(&dev->attach_lock);
 }