test/fixedbugs/bug295.go: fix test in anticipation of future gc fix
test/fixedbugs/bug295.go: fix test in anticipation of future gc fix

See also issue 6428.

R=r, rsc
CC=golang-dev
https://codereview.appspot.com/13794043

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