staging: comedi: comedi_test: remove devpriv macro

index 523a809..c77ce75 100644
@@ -81,7 +81,6 @@ struct waveform_private {
 	unsigned timer_running:1;
 	unsigned int ao_loopbacks[N_CHANS];
 };
-#define devpriv ((struct waveform_private *)dev->private)
 
 /* 1000 nanosec in a microsec */
 static const int nano_per_micro = 1000;

@@ -98,6 +97,7 @@ static const struct comedi_lrange waveform_ai_ranges = {
 static short fake_sawtooth(struct comedi_device *dev, unsigned int range_index,
 			   unsigned long current_time)
 {
+	struct waveform_private *devpriv = dev->private;
 	struct comedi_subdevice *s = dev->read_subdev;
 	unsigned int offset = s->maxdata / 2;
 	u64 value;

@@ -122,6 +122,7 @@ static short fake_squarewave(struct comedi_device *dev,
 			     unsigned int range_index,
 			     unsigned long current_time)
 {
+	struct waveform_private *devpriv = dev->private;
 	struct comedi_subdevice *s = dev->read_subdev;
 	unsigned int offset = s->maxdata / 2;
 	u64 value;

@@ -175,6 +176,7 @@ static short fake_waveform(struct comedi_device *dev, unsigned int channel,
 static void waveform_ai_interrupt(unsigned long arg)
 {
 	struct comedi_device *dev = (struct comedi_device *)arg;
+	struct waveform_private *devpriv = dev->private;
 	struct comedi_async *async = dev->read_subdev->async;
 	struct comedi_cmd *cmd = &async->cmd;
 	unsigned int i, j;

@@ -362,6 +364,7 @@ static int waveform_ai_cmdtest(struct comedi_device *dev,
 static int waveform_ai_cmd(struct comedi_device *dev,
 			   struct comedi_subdevice *s)
 {
+	struct waveform_private *devpriv = dev->private;
 	struct comedi_cmd *cmd = &s->async->cmd;
 
 	if (cmd->flags & TRIG_RT) {

@@ -395,6 +398,8 @@ static int waveform_ai_cmd(struct comedi_device *dev,
 static int waveform_ai_cancel(struct comedi_device *dev,
 			      struct comedi_subdevice *s)
 {
+	struct waveform_private *devpriv = dev->private;
+
 	devpriv->timer_running = 0;
 	del_timer(&devpriv->timer);
 	return 0;

@@ -404,6 +409,7 @@ static int waveform_ai_insn_read(struct comedi_device *dev,
 				 struct comedi_subdevice *s,
 				 struct comedi_insn *insn, unsigned int *data)
 {
+	struct waveform_private *devpriv = dev->private;
 	int i, chan = CR_CHAN(insn->chanspec);
 
 	for (i = 0; i < insn->n; i++)

@@ -416,6 +422,7 @@ static int waveform_ao_insn_write(struct comedi_device *dev,
 				  struct comedi_subdevice *s,
 				  struct comedi_insn *insn, unsigned int *data)
 {
+	struct waveform_private *devpriv = dev->private;
 	int i, chan = CR_CHAN(insn->chanspec);
 
 	for (i = 0; i < insn->n; i++)

@@ -428,6 +435,7 @@ static int waveform_attach(struct comedi_device *dev,
 			   struct comedi_devconfig *it)
 {
 	const struct waveform_board *board = comedi_board(dev);
+	struct waveform_private *devpriv;
 	struct comedi_subdevice *s;
 	int amplitude = it->options[0];
 	int period = it->options[1];

@@ -436,8 +444,10 @@ static int waveform_attach(struct comedi_device *dev,
 
 	dev->board_name = board->name;
 
-	if (alloc_private(dev, sizeof(struct waveform_private)) < 0)
-		return -ENOMEM;
+	ret = alloc_private(dev, sizeof(*devpriv));
+	if (ret < 0)
+		return ret;
+	devpriv = dev->private;
 
 	/* set default amplitude and period */
 	if (amplitude <= 0)

@@ -496,7 +506,9 @@ static int waveform_attach(struct comedi_device *dev,
 
 static void waveform_detach(struct comedi_device *dev)
 {
-	if (dev->private)
+	struct waveform_private *devpriv = dev->private;
+
+	if (devpriv)
 		waveform_ai_cancel(dev, dev->read_subdev);
 }