net: remove unnecessary loop variable copies in tests
Similar to CL 711640.
Change-Id: I5cd9470138c80094eeb497cf4652d6a29cd795a6
GitHub-Last-Rev:
603fb5f4d55a12a773f2cb08b295578fb45ad14e
GitHub-Pull-Request: golang/go#76253
Reviewed-on: https://go-review.googlesource.com/c/go/+/719600
Auto-Submit: Damien Neil <dneil@google.com>
Reviewed-by: Mark Freeman <markfreeman@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Damien Neil <dneil@google.com>