Use mrb_true_or_false_value() / in mrb_obj_equal_m().

src/kernel.c

@@ -96,14 +96,12 @@ static mrb_value
 mrb_obj_equal_m(mrb_state *mrb, mrb_value self)
 {
   mrb_value arg;
+  mrb_bool eql_p;
 
   mrb_get_args(mrb, "o", &arg);
-  if (mrb_obj_equal(mrb, self, arg)) {
-    return mrb_true_value();
-  }
-  else {
-    return mrb_false_value();
-  }
+  eql_p = mrb_obj_equal(mrb, self, arg);
+
+  return mrb_true_or_false_value(eql_p);
 }
 
 static mrb_value