runtime: fix test for new closure representation I've hit it several times already. Currently it crashes with nil deref.
runtime: fix test for new closure representation
I've hit it several times already.
Currently it crashes with nil deref.

R=golang-dev, daniel.morsing, r
CC=golang-dev
https://codereview.appspot.com/10317045

wesolows/golang,wesolows/golang,wesolows/golang,wesolows/golang-old,wesolows/golang-old,wesolows/golang,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang-old,wesolows/golang-old,firebitsbr/golang-old,wesolows/golang,wesolows/golang-old,firebitsbr/golang-old,wesolows/golang,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang-old,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang,firebitsbr/golang-old