vm_method.c: no RTEST on mere flag

* vm_method.c (basic_obj_respond_to): `priv` is not a VALUE but a
  mere flag, so cannot call RTEST() on it.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46442 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

vm_method.c

@@ -1624,7 +1624,7 @@ rb_obj_respond_to(VALUE obj, ID id, int priv)
     VALUE klass = CLASS_OF(obj);
 
     if (rb_method_basic_definition_p(klass, idRespond_to)) {
-	return basic_obj_respond_to(obj, id, !RTEST(priv));
+	return basic_obj_respond_to(obj, id, !priv);
     }
     else {
 	int argc = 1;