staging: comedi: comedi_test: rename waveform_ai_interrupt()

`waveform_ai_interrupt()` is a timer expiry function used to generate
fake waveform data for an analog input subdevice.  Rename it to
`waveform_ai_timer()`.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/comedi_test.c

@@ -176,7 +176,7 @@ static unsigned short fake_waveform(struct comedi_device *dev,
  * It should run in the background; therefore it is scheduled by
  * a timer mechanism.
  */
-static void waveform_ai_interrupt(unsigned long arg)
+static void waveform_ai_timer(unsigned long arg)
 {
 	struct comedi_device *dev = (struct comedi_device *)arg;
 	struct waveform_private *devpriv = dev->private;
@@ -486,8 +486,7 @@ static int waveform_attach(struct comedi_device *dev,
 	for (i = 0; i < s->n_chan; i++)
 		devpriv->ao_loopbacks[i] = s->maxdata / 2;
 
-	setup_timer(&devpriv->ai_timer, waveform_ai_interrupt,
-		    (unsigned long)dev);
+	setup_timer(&devpriv->ai_timer, waveform_ai_timer, (unsigned long)dev);
 
 	dev_info(dev->class_dev,
 		 "%s: %u microvolt, %u microsecond waveform attached\n",