staging: comedi: rti800: remove adc_range from private data

The 'adc_range' is only used in the attach of the board. Remove it
from the private data.
Signed-off-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/rti800.c

@@ -139,9 +139,6 @@ static const struct rti800_board rti800_boardtypes[] = {
 };
 
 struct rti800_private {
-	enum {
-		adc_bipolar10, adc_bipolar5, adc_unipolar10
-	} adc_range;
 	enum {
 		adc_2comp, adc_straight
 	} adc_coding;
@@ -313,7 +310,6 @@ static int rti800_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 		return -ENOMEM;
 	dev->private = devpriv;
 
-	devpriv->adc_range = it->options[3];
 	devpriv->adc_coding = it->options[4];
 	devpriv->dac0_range = it->options[5];
 	devpriv->dac0_coding = it->options[6];
@@ -332,14 +328,14 @@ static int rti800_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 	s->n_chan = (it->options[2] ? 16 : 8);
 	s->insn_read = rti800_ai_insn_read;
 	s->maxdata = 0xfff;
-	switch (devpriv->adc_range) {
-	case adc_bipolar10:
+	switch (it->options[3]) {
+	case 0:
 		s->range_table = &range_rti800_ai_10_bipolar;
 		break;
-	case adc_bipolar5:
+	case 1:
 		s->range_table = &range_rti800_ai_5_bipolar;
 		break;
-	case adc_unipolar10:
+	case 2:
 		s->range_table = &range_rti800_ai_unipolar;
 		break;
 	}