[layout] Fix a return_trace

src/hb-ot-layout-common.hh

@@ -1353,7 +1353,7 @@ struct Lookup
     // Generally we shouldn't end up with an empty lookup as we pre-prune them during the planning
     // phase, but it can happen in rare cases such as when during closure subtable is considered
     // degenerate (see: https://github.com/harfbuzz/harfbuzz/issues/3853)
-    return true;
+    return_trace (true);
   }
 
   template <typename TSubTable>