go.tools/cmd/godex: remove spurious println
go.tools/cmd/godex: remove spurious println

TBR=adonovan

TBR=adonovan
R=adonovan
CC=golang-codereviews
https://codereview.appspot.com/82040043

t-yuki/go.tools.old,t-yuki/go.tools.old,t-yuki/go.tools.old