iio: dac: ad5504: Don't set error code to voltage_uv

regulator_get_voltage() may return negative error code.
Add error checking to avoid setting error code to voltage_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/dac/ad5504.c b/drivers/iio/dac/ad5504.c
index 242bdc7d0044..7f7c026b9d8a 100644
--- a/drivers/iio/dac/ad5504.c
+++ b/drivers/iio/dac/ad5504.c
@@ -296,7 +296,11 @@ static int __devinit ad5504_probe(struct spi_device *spi)
                 if (ret)
                         goto error_put_reg;
 
-                voltage_uv = regulator_get_voltage(reg);
+                ret = regulator_get_voltage(reg);
+                if (ret < 0)
+                        goto error_disable_reg;
+
+                voltage_uv = ret;
         }
 
         spi_set_drvdata(spi, indio_dev);