ICU-20776 Checks for nullness in UMutex::lock()

Adds `U_ASSERT` check before using `m->lock()` to make allocation issues
more apparent at least in debug builds.

There is probably quite a few places like this, but let's try fixing
broken windows.
2 files changed
tree: f3daf7e0fa89ef56dfe8ce9d1e1cc8972c0aebe6
  1. .appveyor.yml
  2. .ci-builds/
  3. .cpyskip.txt
  4. .gitattributes
  5. .github/
  6. .gitignore
  7. .travis.yml
  9. docs/
  10. icu4c/
  11. icu4j/
  12. tools/
  13. vendor/

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