VLM: remove dummy vlc_object_kill()

There is no matching vlc_object_alive() or vlc_object_waitpipe().

src/input/vlm.c

@@ -233,8 +233,6 @@ void vlm_Delete( vlm_t *p_vlm )
     TAB_CLEAN( p_vlm->i_schedule, p_vlm->schedule );
     vlc_mutex_unlock( &p_vlm->lock );
 
-    vlc_object_kill( p_vlm );
-
     if( p_vlm->p_vod )
     {
         module_unneed( p_vlm->p_vod, p_vlm->p_vod->p_module );