media: v4l2-core: fix entity initialization in device_register_subdev

The entity variable was being initialized in the wrong place, before the
parameters have been checked.
To solve this, completely removed the entity variable and replaced it
with the initialization value : &sd->entity.
This will avoid dereferencing 'sd' pointer before it's being checked if
it's NULL.

Fixes: 61f5db549dde ("[media] v4l: Make v4l2_subdev inherit from media_entity")

Signed-off-by: Eugen Hristev <[e-mail]>
Acked-by: Sakari Ailus <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/v4l2-core/v4l2-device.c

···
 int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
 				struct v4l2_subdev *sd)
 {
-#if defined(CONFIG_MEDIA_CONTROLLER)
-	struct media_entity *entity = &sd->entity;
-#endif
 	int err;
 
 	/* Check for valid input */
···
 #if defined(CONFIG_MEDIA_CONTROLLER)
 	/* Register the entity. */
 	if (v4l2_dev->mdev) {
-		err = media_device_register_entity(v4l2_dev->mdev, entity);
+		err = media_device_register_entity(v4l2_dev->mdev, &sd->entity);
 		if (err < 0)
 			goto error_module;
 	}
···
 
 error_unregister:
 #if defined(CONFIG_MEDIA_CONTROLLER)
-	media_device_unregister_entity(entity);
+	media_device_unregister_entity(&sd->entity);
 #endif
 error_module:
 	if (!sd->owner_v4l2_dev)