media: v4l2-dev.h: fix symbol collision in media_entity_to_video_device()

A recent change to the media_entity_to_video_device() macro breaks some
use-cases for the macro due to a symbol collision. Before the change
this worked:

    vdev = media_entity_to_video_device(link->sink->entity);

While after the change it results in a compiler error "error: 'struct
video_device' has no member named 'link'; did you mean 'lock'?". While
the following still works after the change.

    struct media_entity *entity = link->sink->entity;
    vdev = media_entity_to_video_device(entity);

Fix the collision by renaming the macro argument to '__entity'.

Fixes: 69b925c5fc36d8f1 ("media: v4l2-dev.h: add kernel-doc to two macros")

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

include/media/v4l2-dev.h

@@ -298,10 +298,10 @@ struct video_device
  * media_entity_to_video_device - Returns a &struct video_device from
  *	the &struct media_entity embedded on it.
  *
- * @entity: pointer to &struct media_entity
+ * @__entity: pointer to &struct media_entity
  */
-#define media_entity_to_video_device(entity) \
-	container_of(entity, struct video_device, entity)
+#define media_entity_to_video_device(__entity) \
+	container_of(__entity, struct video_device, entity)
 
 /**
  * to_video_device - Returns a &struct video_device from the