iio: common: ssp_sensors: account for const type of of_device_id.data

This driver creates a number of const structures that it stores in the
data field of an of_device_id array.

Add const to the declaration of the location that receives a value
from the data field to ensure that the compiler will continue to check
that the value is not modified and remove the const-dropping cast on
the access to the data field.

Done using Coccinelle.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/iio/common/ssp_sensors/ssp.h

@@ -188,7 +188,7 @@ struct ssp_sensorhub_info {
  */
 struct ssp_data {
 	struct spi_device *spi;
-	struct ssp_sensorhub_info *sensorhub_info;
+	const struct ssp_sensorhub_info *sensorhub_info;
 	struct timer_list wdt_timer;
 	struct work_struct work_wdt;
 	struct delayed_work work_refresh;

drivers/iio/common/ssp_sensors/ssp_dev.c

@@ -486,7 +486,7 @@ static struct ssp_data *ssp_parse_dt(struct device *dev)
 	if (!match)
 		goto err_mcu_reset_gpio;
 
-	data->sensorhub_info = (struct ssp_sensorhub_info *)match->data;
+	data->sensorhub_info = match->data;
 
 	dev_set_drvdata(dev, data);