iio: adc: meson-saradc: fix potential crash in meson_sar_adc_clear_fifo

meson_sar_adc_clear_fifo passes a 0 as value-pointer to regmap_read(). In case of the meson-saradc driver this ends up in regmap_mmio_read(), where the value-pointer is de-referenced unconditionally to assign the value which was read.
Fix this by passing an actual pointer, even though all we want to do is to discard the value.

As a side-effect this fixes a sparse warning ("Using plain integer as NULL pointer") as reported by Paolo Cretaro.

Fixes 3adbf3427330 ("iio: adc: add a driver for the SAR ADC found in Amlogic Meson SoCs")

Reported-by Paolo Cretaro <[email protected]>

Signed-off-by Martin Blumenstingl <[email protected]>

---
 drivers/iio/adc/meson_saradc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

drivers/iio/adc/meson_saradc.c +2 -2

index 81cd39a57fe3..83da50ed73ab 100644
@@ -475,13 +475,13 @@ static void meson_sar_adc_unlock(struct iio_dev *indio_dev)
 static void meson_sar_adc_clear_fifo(struct iio_dev *indio_dev)
 {
 	struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
-	int count;
+	unsigned int count, tmp;
 
 	for (count = 0; count < MESON_SAR_ADC_MAX_FIFO_SIZE; count++) {
 		if (!meson_sar_adc_get_fifo_count(indio_dev))
 			break;
 
-		regmap_read(priv->regmap, MESON_SAR_ADC_FIFO_RD, 0);
+		regmap_read(priv->regmap, MESON_SAR_ADC_FIFO_RD, &tmp);
 	}
 }