[PATCH][next] iio: temperature: max31856: fix uninitialized error return

[Colin King]

From: Colin Ian King <colin.k...@canonical.com>

Currently if mask is neither CHAN_INFO_RAW or CHAN_INFO_SCALE then
then an uninitialized error return 'ret' is returned. Fix this by
adding a default case that ensures -EINVAL is returned for this
specific case.

Addresses-Coverity: ("Uninitialized scalar variable")
Signed-off-by: Colin Ian King <colin.k...@canonical.com>
---
 drivers/iio/temperature/max31856.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iio/temperature/max31856.c 
b/drivers/iio/temperature/max31856.c
index 6b67d6b95cf9..f184ba5601d9 100644
--- a/drivers/iio/temperature/max31856.c
+++ b/drivers/iio/temperature/max31856.c
@@ -210,6 +210,9 @@ static int max31856_read_raw(struct iio_dev *indio_dev,
                        return IIO_VAL_INT_PLUS_MICRO;
                }
                break;
+       default:
+               ret = -EINVAL;
+               break;
        }
 
        return ret;
-- 
2.20.1