mruby/mruby — pull request #2634 by xxuejie (2014-11-10 02:15:38+00:00)
Title: Fix mrb_iv_check function decleration

In the header file, the returned type for `mrb_iv_check` is `mrb_bool`.

However, at [here](https://github.com/mruby/mruby/blob/master/src/variable.c#L564) we can find the real returned type is `void`.