iio: adc: ad7298: check regulator for null in ad7298_get_ref_voltage()

'st->ext_ref' & 'st->reg' are both non-zero/non-null at the same time, so
logically the code isn't broken.
But it is more correct to check that 'st->reg' is non-null, since we make
sure that the regulator is NULL (in probe) in case one isn't defined.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Cc: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20201127094038.91714-2-alexandru.ardelean@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/ad7298.c b/drivers/iio/adc/ad7298.c
index ecdb01b..689ecd5 100644 (file)
--- a/drivers/iio/adc/ad7298.c
+++ b/drivers/iio/adc/ad7298.c
@@ -214,7 +214,7 @@ static int ad7298_get_ref_voltage(struct ad7298_state *st)
 {
        int vref;
 
-       if (st->ext_ref) {
+       if (st->reg) {
                vref = regulator_get_voltage(st->reg);
                if (vref < 0)
                        return vref;