cmd/go: fix get -tool when multiple packages are provided
Fixes #74035
Change-Id: I51865f4f753aade9a8be62ed6f9bc2d298742bf1
Reviewed-on: https://go-review.googlesource.com/c/go/+/679975 Reviewed-by: Ian Alexander <jitsu@google.com> Reviewed-by: Michael Matloob <matloob@google.com> Reviewed-by: Michael Matloob <matloob@golang.org>
Auto-Submit: Sean Liao <sean@liao.dev>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Sean Liao <sean@liao.dev>