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

pombredanne/go-deleteme,gnanderson/go,tv42/old-go,apparentlymart/golang,apparentlymart/golang,tv42/old-go,pombredanne/go-deleteme,pombredanne/go-deleteme,tv42/old-go,apparentlymart/golang,pombredanne/go-deleteme,tv42/old-go,pombredanne/go-deleteme,pombredanne/go-deleteme,apparentlymart/golang,apparentlymart/golang,gnanderson/go,gnanderson/go,tv42/old-go,gnanderson/go,gnanderson/go,gnanderson/go,tv42/old-go,tv42/old-go,pombredanne/go-deleteme,apparentlymart/golang,apparentlymart/golang,gnanderson/go