iio: adc: ad7266: Don't set error code to st->vref_uv

regulator_get_voltage() may return negative error code.
Add error checking to avoid setting error code to st->vref_uv.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/iio/adc/ad7266.c b/drivers/iio/adc/ad7266.c
index a6f4fc5f8201..e36107dc30b9 100644
--- a/drivers/iio/adc/ad7266.c
+++ b/drivers/iio/adc/ad7266.c
@@ -411,7 +411,11 @@ static int __devinit ad7266_probe(struct spi_device *spi)
                 if (ret)
                         goto error_put_reg;
 
-                st->vref_uv = regulator_get_voltage(st->reg);
+                ret = regulator_get_voltage(st->reg);
+                if (ret < 0)
+                        goto error_disable_reg;
+
+                st->vref_uv = ret;
         } else {
                 /* Use internal reference */
                 st->vref_uv = 2500000;