[brcmfmac] Sim firmware error injection fix.

A bug in the simulated firmware error injection class was discovered
where an attempt to change an already-injected firmware error would
silently fail. This change corrects that error, adds tests, and performs
some test and style cleanups:

- implicit nullptr comparisons are made explicit
- a large unit test was split into two focused tests

BUG=65917

Test: Existing unit tests were augmented to verify that changing an
already-injected firmware error works; new unit tests were added to
verify that the CheckErrInj* methods work.

Change-Id: Ib47c7d9a94550eff39bad460755d557b285e3186
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/525352
Reviewed-by: Karthik Krishnaswami <karthikrish@google.com>
Commit-Queue: Karl Ward <karlward@google.com>
3 files changed
tree: ff1ccc56b402ae4d0e7791cd14e6382efb812062
  1. boards/
  2. build/
  3. buildtools/
  4. bundles/
  5. docs/
  6. examples/
  7. garnet/
  8. products/
  9. scripts/
  10. sdk/
  11. src/
  12. third_party/
  13. tools/
  14. zircon/
  15. .clang-format
  16. .clang-tidy
  17. .git-blame-ignore-revs
  18. .gitattributes
  19. .gitignore
  20. .gn
  21. .style.yapf
  22. AUTHORS
  23. BUILD.gn
  24. CODE_OF_CONDUCT.md
  25. CONTRIBUTING.md
  26. LICENSE
  27. OWNERS
  28. PATENTS
  29. README.md
  30. rustfmt.toml
README.md

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