staging: comedi: pcmad: remove subdevice pointer math

Convert the comedi_subdevice access from pointer math to array
access.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/pcmad.c

@@ -127,7 +127,7 @@ static int pcmad_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 
 	dev->board_name = board->name;
 
-	s = dev->subdevices + 0;
+	s = &dev->subdevices[0];
 	s->type = COMEDI_SUBD_AI;
 	s->subdev_flags = SDF_READABLE | AREF_GROUND;
 	s->n_chan = 16;		/* XXX */