fix(CI): clippy unnecessary unwrap

[aaron-ang]

Fix CI failure due to newer clippy version in CI.

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/tty/tty-eof (passes in this run but fails in the 'main' branch)

[codspeed-hq]

Merging this PR will degrade performance by 5.36%

⚡ 3 improved benchmarks
❌ 3 regressed benchmarks
✅ 136 untouched benchmarks
⏩ 180 skipped benchmarks¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	seq_custom_separator	28.7 ms	30.1 ms	-4.81%
❌	Simulation	seq_integers	26.1 ms	27.6 ms	-5.25%
❌	Simulation	seq_with_step	13.3 ms	14.1 ms	-5.36%
⚡	Simulation	unexpand_large_file[10]	592.4 ms	553.5 ms	+7.02%
⚡	Simulation	unexpand_many_lines[100000]	282.6 ms	264 ms	+7.02%
⚡	Simulation	mv_multiple_to_dir	12.9 ms	12.4 ms	+4.1%

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_{Comparing aaron-ang:clippy-hotfix (df04d02) with main (2de0a5b)}

Footnotes

1. 180 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/shuf/shuf-reservoir (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/sort/sort-stale-thread-mem (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)

[cakebaker]

Thanks!