[patch] iio: light: signedness bug in stk3310_write_raw()

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"index" needs to be signed for the error handling to work.

Fixes: be9e6229d676 ('iio: light: Add support for Sensortek STK3310')
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

diff --git a/drivers/iio/light/stk3310.c b/drivers/iio/light/stk3310.c
index e79b9d8..fee4297 100644
--- a/drivers/iio/light/stk3310.c
+++ b/drivers/iio/light/stk3310.c
@@ -370,7 +370,7 @@ static int stk3310_write_raw(struct iio_dev *indio_dev,
 			     int val, int val2, long mask)
 {
 	int ret;
-	unsigned int index;
+	int index;
 	struct stk3310_data *data = iio_priv(indio_dev);
 
 	switch (mask) {
--
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