staging: iio: cdc: ad7746: Remove unnecessary assignment in ad7746_probe()

In the function ad7746_probe(), the initialized value of 'ret' is unused,
because it will be assigned by the function i2c_smbus_write_byte_data(),
thus remove it.
Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20210518095647.3008-1-tangbin@cmss.chinamobile.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/staging/iio/cdc/ad7746.c

@@ -680,7 +680,7 @@ static int ad7746_probe(struct i2c_client *client,
 	struct ad7746_chip_info *chip;
 	struct iio_dev *indio_dev;
 	unsigned char regval = 0;
-	int ret = 0;
+	int ret;
 
 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
 	if (!indio_dev)