Fix the same vout leak when vlc_clone fails

src/video_output/video_output.c

@@ -533,6 +533,9 @@ vout_thread_t * __vout_Create( vlc_object_t *p_parent, video_format_t *p_fmt )
     {
         module_unneed( p_vout, p_vout->p_module );
         p_vout->p_module = NULL;
+        spu_Attach( p_vout->p_spu, p_vout, false );
+        spu_Destroy( p_vout->p_spu );
+        p_vout->p_spu = NULL;
         vlc_object_release( p_vout );
         return NULL;
     }