iio: ad5624r_spi: Remove redundant variable

By re-arranging the code, 'ret' can be removed from this
function.

Signed-off-by: Sachin Kamat <sachin.kamat@samsung.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/dac/ad5624r_spi.c

@@ -67,7 +67,6 @@ static int ad5624r_write_raw(struct iio_dev *indio_dev,
 			       long mask)
 {
 	struct ad5624r_state *st = iio_priv(indio_dev);
-	int ret;
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
@@ -79,10 +78,8 @@ static int ad5624r_write_raw(struct iio_dev *indio_dev,
 				chan->address, val,
 				chan->scan_type.shift);
 	default:
-		ret = -EINVAL;
+		return -EINVAL;
 	}
-
-	return -EINVAL;
 }
 
 static const char * const ad5624r_powerdown_modes[] = {