crypto/tls: make config.Clone return nil if the source is nil

Fixes #40565

Change-Id: I13a67be193f8cd68df02b8729529e627a73d364b
GitHub-Last-Rev: b03d2c04fd88db909b40dfd7bd08fe13d8994ab9
GitHub-Pull-Request: golang/go#40566
Reviewed-on: https://go-review.googlesource.com/c/go/+/246637
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Trust: Emmanuel Odeke <emm.odeke@gmail.com>
2 files changed
tree: 2654f76476d9b1635a63d3ab92a6b1110abba21c
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
  18. SECURITY.md
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