media: atomisp: gc0310: Use devm_kzalloc() for data struct

Use devm_kzalloc() to allocate the data struct. It is always free-ed as
the last step of probe-error-exit or remove, so it can be devm-managed.

This will make unwinding things easier when support is added to the gc0310
code to use standard GPIO APIs instead of the custom atomisp_gmin code.

This also allows dropping the out_free label and use direct return
on errors.

This may seem like a functional change since the out_free label also
did a v4l2_device_unregister_subdev() but at the 1 changed return
the device is not registered yet, so that always is a no-op and can
be dropped.
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/atomisp/i2c/atomisp-gc0310.c

@@ -546,7 +546,7 @@ static int gc0310_probe(struct i2c_client *client)
 	int ret;
 	void *pdata;
 
-	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+	dev = devm_kzalloc(&client->dev, sizeof(*dev), GFP_KERNEL);
 	if (!dev)
 		return -ENOMEM;
 
@@ -557,10 +557,8 @@ static int gc0310_probe(struct i2c_client *client)
 	pdata = gmin_camera_platform_data(&dev->sd,
 					  ATOMISP_INPUT_FORMAT_RAW_8,
 					  atomisp_bayer_order_grbg);
-	if (!pdata) {
-		ret = -EINVAL;
-		goto out_free;
-	}
+	if (!pdata)
+		return -EINVAL;
 
 	pm_runtime_set_suspended(&client->dev);
 	pm_runtime_enable(&client->dev);
@@ -594,10 +592,6 @@ static int gc0310_probe(struct i2c_client *client)
 		gc0310_remove(client);
 
 	return ret;
-out_free:
-	v4l2_device_unregister_subdev(&dev->sd);
-	kfree(dev);
-	return ret;
 }
 
 static int gc0310_suspend(struct device *dev)