[media] exynos4-is: Fix regulator/gpio resource releasing on the driver removal

Remove regulator_bulk_free() calls as devm_regulator_bulk_get() function
is used to get the regulators so those will be freed automatically while
the driver is removed.
Missing gpio free is fixed by requesting a gpio with the devm_* API.
All that is done now in the I2C client driver remove() callback is the
media entity cleanup call.
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/platform/exynos4-is/fimc-is-sensor.c

@@ -216,7 +216,8 @@ static int fimc_is_sensor_probe(struct i2c_client *client,
 
 	gpio = of_get_gpio_flags(dev->of_node, 0, NULL);
 	if (gpio_is_valid(gpio)) {
-		ret = gpio_request_one(gpio, GPIOF_OUT_INIT_LOW, DRIVER_NAME);
+		ret = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_LOW,
+							DRIVER_NAME);
 		if (ret < 0)
 			return ret;
 	}
@@ -228,13 +229,11 @@ static int fimc_is_sensor_probe(struct i2c_client *client,
 	ret = devm_regulator_bulk_get(&client->dev, SENSOR_NUM_SUPPLIES,
 				      sensor->supplies);
 	if (ret < 0)
-		goto err_gpio;
+		return ret;
 
 	of_id = of_match_node(fimc_is_sensor_of_match, dev->of_node);
-	if (!of_id) {
-		ret = -ENODEV;
-		goto err_reg;
-	}
+	if (!of_id)
+		return -ENODEV;
 
 	sensor->drvdata = of_id->data;
 	sensor->dev = dev;
@@ -251,28 +250,19 @@ static int fimc_is_sensor_probe(struct i2c_client *client,
 	sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
 	ret = media_entity_init(&sd->entity, 1, &sensor->pad, 0);
 	if (ret < 0)
-		goto err_reg;
+		return ret;
 
 	v4l2_set_subdevdata(sd, sensor);
 	pm_runtime_no_callbacks(dev);
 	pm_runtime_enable(dev);
 
-	return 0;
-err_reg:
-	regulator_bulk_free(SENSOR_NUM_SUPPLIES, sensor->supplies);
-err_gpio:
-	if (gpio_is_valid(sensor->gpio_reset))
-		gpio_free(sensor->gpio_reset);
 	return ret;
 }
 
 static int fimc_is_sensor_remove(struct i2c_client *client)
 {
-	struct fimc_is_sensor *sensor;
-
-	regulator_bulk_free(SENSOR_NUM_SUPPLIES, sensor->supplies);
-	media_entity_cleanup(&sensor->subdev.entity);
-
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	media_entity_cleanup(&sd->entity);
 	return 0;
 }