staging: comedi: usbdux: 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/usbdux.c

@@ -404,7 +404,7 @@ static void usbduxsub_ai_IsocIrq(struct urb *urb)
 	/* the private structure of the subdevice is struct usbduxsub */
 	this_usbduxsub = this_comedidev->private;
 	/* subdevice which is the AD converter */
-	s = this_comedidev->subdevices + SUBDEV_AD;
+	s = &this_comedidev->subdevices[SUBDEV_AD];
 
 	/* first we test if something unusual has just happened */
 	switch (urb->status) {
@@ -604,7 +604,7 @@ static void usbduxsub_ao_IsocIrq(struct urb *urb)
 	/* the private structure of the subdevice is struct usbduxsub */
 	this_usbduxsub = this_comedidev->private;
 
-	s = this_comedidev->subdevices + SUBDEV_DA;
+	s = &this_comedidev->subdevices[SUBDEV_DA];
 
 	switch (urb->status) {
 	case 0:
@@ -1947,7 +1947,7 @@ static void usbduxsub_pwm_irq(struct urb *urb)
 	/* the private structure of the subdevice is struct usbduxsub */
 	this_usbduxsub = this_comedidev->private;
 
-	s = this_comedidev->subdevices + SUBDEV_DA;
+	s = &this_comedidev->subdevices[SUBDEV_DA];
 
 	switch (urb->status) {
 	case 0:
@@ -2331,7 +2331,7 @@ static int usbdux_attach_common(struct comedi_device *dev,
 	dev->private = udev;
 
 	/* the first subdevice is the A/D converter */
-	s = dev->subdevices + SUBDEV_AD;
+	s = &dev->subdevices[SUBDEV_AD];
 	/* the URBs get the comedi subdevice */
 	/* which is responsible for reading */
 	/* this is the subdevice which reads data */
@@ -2358,7 +2358,7 @@ static int usbdux_attach_common(struct comedi_device *dev,
 	s->range_table = (&range_usbdux_ai_range);
 
 	/* analog out */
-	s = dev->subdevices + SUBDEV_DA;
+	s = &dev->subdevices[SUBDEV_DA];
 	/* analog out */
 	s->type = COMEDI_SUBD_AO;
 	/* backward pointer */
@@ -2384,7 +2384,7 @@ static int usbdux_attach_common(struct comedi_device *dev,
 	s->insn_write = usbdux_ao_insn_write;
 
 	/* digital I/O */
-	s = dev->subdevices + SUBDEV_DIO;
+	s = &dev->subdevices[SUBDEV_DIO];
 	s->type = COMEDI_SUBD_DIO;
 	s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
 	s->n_chan = 8;
@@ -2396,7 +2396,7 @@ static int usbdux_attach_common(struct comedi_device *dev,
 	s->private = NULL;
 
 	/* counter */
-	s = dev->subdevices + SUBDEV_COUNTER;
+	s = &dev->subdevices[SUBDEV_COUNTER];
 	s->type = COMEDI_SUBD_COUNTER;
 	s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
 	s->n_chan = 4;
@@ -2407,7 +2407,7 @@ static int usbdux_attach_common(struct comedi_device *dev,
 
 	if (udev->high_speed) {
 		/* timer / pwm */
-		s = dev->subdevices + SUBDEV_PWM;
+		s = &dev->subdevices[SUBDEV_PWM];
 		s->type = COMEDI_SUBD_PWM;
 		s->subdev_flags = SDF_WRITABLE | SDF_PWM_HBRIDGE;
 		s->n_chan = 8;