fix bug with wrong errfunc index, caused by https://github.com/luvit/luv/commit/e5ec37cd6c16c963ce9158cf0b422a6276c030a9
fix bug with wrong errfunc index, caused by https://github.com/luvit/luv/commit/e5ec37cd6c16c963ce9158cf0b422a6276c030a9

joerg-krause/luv,luvit/luv,zhaozg/luv,zhaozg/luv,luvit/luv,joerg-krause/luv