iio: adc: ad9467: don't ignore error codes

Make sure functions that return errors are not ignored.

Fixes: ad679712 ("iio: adc: ad9467: add support AD9467 ADC")
Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Nuno Sa <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20231207-iio-backend-prep-v2-2-a4a33bc4d70e@analog.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/ad9467.c

@@ -162,9 +162,10 @@ static int ad9467_reg_access(struct adi_axi_adc_conv *conv, unsigned int reg,
 
 	if (readval == NULL) {
 		ret = ad9467_spi_write(spi, reg, writeval);
-		ad9467_spi_write(spi, AN877_ADC_REG_TRANSFER,
-				 AN877_ADC_TRANSFER_SYNC);
-		return ret;
+		if (ret)
+			return ret;
+		return ad9467_spi_write(spi, AN877_ADC_REG_TRANSFER,
+					AN877_ADC_TRANSFER_SYNC);
 	}
 
 	ret = ad9467_spi_read(spi, reg);
@@ -272,10 +273,13 @@ static int ad9467_get_scale(struct adi_axi_adc_conv *conv, int *val, int *val2)
 	const struct ad9467_chip_info *info1 = to_ad9467_chip_info(info);
 	struct ad9467_state *st = adi_axi_adc_conv_priv(conv);
 	unsigned int i, vref_val;
+	int ret;
 
-	vref_val = ad9467_spi_read(st->spi, AN877_ADC_REG_VREF);
+	ret = ad9467_spi_read(st->spi, AN877_ADC_REG_VREF);
+	if (ret < 0)
+		return ret;
 
-	vref_val &= info1->vref_mask;
+	vref_val = ret & info1->vref_mask;
 
 	for (i = 0; i < info->num_scales; i++) {
 		if (vref_val == info->scale_table[i][1])
@@ -296,6 +300,7 @@ static int ad9467_set_scale(struct adi_axi_adc_conv *conv, int val, int val2)
 	struct ad9467_state *st = adi_axi_adc_conv_priv(conv);
 	unsigned int scale_val[2];
 	unsigned int i;
+	int ret;
 
 	if (val != 0)
 		return -EINVAL;
@@ -305,11 +310,13 @@ static int ad9467_set_scale(struct adi_axi_adc_conv *conv, int val, int val2)
 		if (scale_val[0] != val || scale_val[1] != val2)
 			continue;
 
-		ad9467_spi_write(st->spi, AN877_ADC_REG_VREF,
-				 info->scale_table[i][1]);
-		ad9467_spi_write(st->spi, AN877_ADC_REG_TRANSFER,
-				 AN877_ADC_TRANSFER_SYNC);
-		return 0;
+		ret = ad9467_spi_write(st->spi, AN877_ADC_REG_VREF,
+				       info->scale_table[i][1]);
+		if (ret < 0)
+			return ret;
+
+		return ad9467_spi_write(st->spi, AN877_ADC_REG_TRANSFER,
+					AN877_ADC_TRANSFER_SYNC);
 	}
 
 	return -EINVAL;