iio: adc: ad4851: Fix signedness bug in ad4851_calibrate()

The "c" variable is used to store error codes from ad4851_find_opt()
so it has to be signed for the error handling to work.  Change it
to type int.

Fixes: 6250803fe2ec ("iio: adc: ad4851: add ad485x driver")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/f5e260e9-d7a8-4dae-b7ea-f1bbb1760e60@stanley.mountain
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/ad4851.c b/drivers/iio/adc/ad4851.c
index 1ad37084355eb4cbd79beb1ce366e59502da220e..98ebc853db79629d577a8884105a279427eb67f6 100644 (file)
--- a/drivers/iio/adc/ad4851.c
+++ b/drivers/iio/adc/ad4851.c
@@ -492,11 +492,11 @@ static int ad4851_find_opt(const unsigned long *field, unsigned int start,
 static int ad4851_calibrate(struct iio_dev *indio_dev)
 {
        struct ad4851_state *st = iio_priv(indio_dev);
-       unsigned int opt_delay, num_lanes, delay, i, s, c;
+       unsigned int opt_delay, num_lanes, delay, i, s;
        enum iio_backend_interface_type interface_type;
        DECLARE_BITMAP(pn_status, AD4851_MAX_LANES * AD4851_MAX_IODELAY);
        bool status;
-       int ret;
+       int c, ret;
 
        ret = iio_backend_interface_type_get(st->back, &interface_type);
        if (ret)