[patch] iio: imu: adis16400: Fix sign extension

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Because of C's type promotion rules, the code shifts in
"((val16 & 0xFFF) << 4) >> 4;" cancel each other out and they're a
no-op.

The intention here was to sign-extend then 11th bit so we can use the
sign_extend32() function.

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
Please review this carefully.  I'm pretty sure it's correct but this is
the first time I've ever used the sign_extend32() function.

diff --git a/drivers/iio/imu/adis16400_core.c b/drivers/iio/imu/adis16400_core.c
index b70873d..ed636c9 100644
--- a/drivers/iio/imu/adis16400_core.c
+++ b/drivers/iio/imu/adis16400_core.c
@@ -414,7 +414,7 @@ static int adis16400_read_raw(struct iio_dev *indio_dev,
 		mutex_unlock(&indio_dev->mlock);
 		if (ret)
 			return ret;
-		val16 = ((val16 & 0xFFF) << 4) >> 4;
+		val16 = sign_extend32(val16, 11);
 		*val = val16;
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_OFFSET:
--
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