test: add missing import for zerodivide
test: add missing import for zerodivide

R=rsc
CC=golang-dev, r
http://codereview.appspot.com/1706043

Committer: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>

tav/go,tav/go,tav/go,tav/go,tav/go,tav/go,tav/go