Passes toolstash -cmp on std cmd.

Change-Id: I17b9a816752af55b064b8e46146b8f5a878fa560
Reviewed-on: https://go-review.googlesource.com/109075
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>