[PATCH v2 3/6] iio: dac: ad5504: Don't set error code to voltage_uv

[Axel Lin <axel.lin@ingics.com>]

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>
---
v2: check if ret is negative value
 drivers/iio/dac/ad5504.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/dac/ad5504.c b/drivers/iio/dac/ad5504.c
index 242bdc7..1e9a1f4 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);
-- 
1.7.9.5