clippy: fix nightly lints

[xtqqczze]

• clippy::unnecessary_trailing_comma
• clippy::map_unwrap_or

[sylvestre]

can you force it to make sure we don't regress? thanks

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/timeout/timeout-group. tests/timeout/timeout-group is passing on 'main'. Maybe you have to rebase?
Skip an intermittent issue tests/pr/bounded-memory (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/tty/tty-eof (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/printf/printf-surprise is now being skipped but was previously passing.
Note: The gnu test tests/env/env-signal-handler was skipped on 'main' but is now failing.

[xtqqczze]

can you force it to make sure we don't regress? thanks

that would require we switch to nightly clippy in CI (and in pre-commit)

[oech3]

unnecessary_trailing_comma reduces diff in some cases.

[xtqqczze]

unnecessary_trailing_comma reduces diff in some cases.

unnecessary_trailing_comma is only for single-line macro invocations