staging:iio:ad2s90: Remove always overwritten assignment

This patch removes an initial assignment to the variable ret at probe,
that was always overwritten.

Signed-off-by: Matheus Tavares <matheus.bernardino@usp.br>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/staging/iio/resolver/ad2s90.c

@@ -62,7 +62,7 @@ static int ad2s90_probe(struct spi_device *spi)
 {
 	struct iio_dev *indio_dev;
 	struct ad2s90_state *st;
-	int ret = 0;
+	int ret;
 
 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
 	if (!indio_dev)