iio: ad5504: 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/ad5504.c

@@ -125,7 +125,6 @@ static int ad5504_write_raw(struct iio_dev *indio_dev,
 			       long mask)
 {
 	struct ad5504_state *st = iio_priv(indio_dev);
-	int ret;
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
@@ -134,10 +133,8 @@ static int ad5504_write_raw(struct iio_dev *indio_dev,
 
 		return ad5504_spi_write(st, chan->address, val);
 	default:
-		ret = -EINVAL;
-	}
-
 		return -EINVAL;
+	}
 }
 
 static const char * const ad5504_powerdown_modes[] = {