Remove no-op vlc_object-kill in vlc_object_destroy

If the object has no references left, b_alive is irrelevant.

src/misc/objects.c

@@ -255,9 +255,6 @@ static void vlc_object_destroy( vlc_object_t *p_this )
 {
     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 
-    /* Send a kill to the object's thread if applicable */
-    vlc_object_kill( p_this );
-
     /* Call the custom "subclass" destructor */
     if( p_priv->pf_destructor )
         p_priv->pf_destructor( p_this );