Update src/node_messaging.cc

Co-authored-by: Anna Henningsen <github@addaleax.net>

Author: jazelly

src/node_messaging.cc

@@ -445,13 +445,7 @@ Maybe<bool> IsDOMException(Isolate* isolate,
 
   Local<Function> dom_exception_ctor = dom_exception_ctor_val.As<Function>();
 
-  Maybe<bool> result = obj->InstanceOf(context, dom_exception_ctor);
-
-  if (result.IsNothing()) {
-    return Nothing<bool>();
-  }
-
-  return Just(result.FromJust());
+  return obj->InstanceOf(context, dom_exception_ctor);
 }
 
 // This tells V8 how to serialize objects that it does not understand