[release-branch.go1.18] net/http/httptest: fix race in Server.Close

When run with race detector the test fails without the fix.

For #51799
Fixes #51897

Change-Id: I273adb6d3a2b1e0d606b9c27ab4c6a9aa4aa8064
GitHub-Last-Rev: a5ddd146a2a65f2e817eed5133449c79b3af2562
GitHub-Pull-Request: golang/go#51805
Reviewed-on: https://go-review.googlesource.com/c/go/+/393974
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Trust: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
(cherry picked from commit 1d19cea740a5a044848aaab3dc119f60c947be1d)
Reviewed-on: https://go-review.googlesource.com/c/go/+/401317
Reviewed-by: David Chase <drchase@google.com>
2 files changed
tree: d516c59744618e84124b7eab96920863f3c52a95
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. codereview.cfg
  12. CONTRIBUTING.md
  13. CONTRIBUTORS
  14. LICENSE
  15. PATENTS
  16. README.md
  17. SECURITY.md
  18. VERSION
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