libcamera: media_object: Remove unneeded destructors

The MediaEntity, MediaLink and MediaPad classes don't need custom
destructors. For MediaEntity and MediaPad, the destructors clear a
vector embedded in the classes, which will be done by the default
destructor. For MediaLink, the destructor is already empty. Remove them.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <email@uajain.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/libcamera/media_object.cpp

@@ -191,15 +191,6 @@ MediaPad::MediaPad(const struct media_v2_pad *pad, MediaEntity *entity)
 {
 }
 
-MediaPad::~MediaPad()
-{
-	/*
-	 * Don't delete the links as we only borrow the reference owned by
-	 * MediaDevice.
-	 */
-	links_.clear();
-}
-
 /**
  * \fn MediaPad::index()
  * \brief Retrieve the pad index
@@ -371,15 +362,6 @@ MediaEntity::MediaEntity(MediaDevice *dev,
 {
 }
 
-MediaEntity::~MediaEntity()
-{
-	/*
-	 * Don't delete the pads as we only borrow the reference owned by
-	 * MediaDevice.
-	 */
-	pads_.clear();
-}
-
 /**
  * \brief Add \a pad to the entity's list of pads
  * \param[in] pad The pad to add to the list