[usb][audio] fix flaky test

Unplug only expects MAX_OUTSTANDING_REQUESTS number of completions.
Don't keep responding to requests even if there are no requests to
complete.

Bug: 130202

MULTIPLY: usb-audio-test

Change-Id: I6ca56b1f855315db818a452d3bd7cbe2299d90b8
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/883115
Commit-Queue: Ruby Zhuang <rdzhuang@google.com>
Reviewed-by: Jack Brennen <jbrennen@google.com>
1 file changed
tree: 5ef35d00ae149f1d99c3e4d15aad054ee0c13c8a
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. infra/
  7. products/
  8. scripts/
  9. sdk/
  10. src/
  11. third_party/
  12. tools/
  13. zircon/
  14. .clang-format
  15. .clang-tidy
  16. .editorconfig
  17. .git-blame-ignore-revs
  18. .gitattributes
  19. .gitignore
  20. .gitmodules
  21. .gn
  22. .ignore
  23. .style.yapf
  24. analysis_options.yaml
  25. AUTHORS
  26. BUILD.gn
  27. CODE_OF_CONDUCT.md
  28. CONTRIBUTING.md
  29. fuchsia.code-workspace
  30. LICENSE
  31. OWNERS
  32. PATENTS
  33. pyrightconfig.json
  34. README.md
  35. rustfmt.toml
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