clippy: fix needless_continue lint

[xtqqczze]

https://rust-lang.github.io/rust-clippy/master/index.html#needless_continue

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/shuf/shuf-reservoir (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/sort/sort-stale-thread-mem (passes in this run but fails in the 'main' branch)
Congrats! The gnu test tests/ptx/ptx-overrun is no longer failing!

[codspeed-hq]

CodSpeed Performance Report

Merging this PR will degrade performance by 15.41%

_{Comparing xtqqczze:clippy/needless_continue (d9ea635) with main (356567e)}

Summary

⚡ 6 improved benchmarks
❌ 2 regressed benchmarks
✅ 274 untouched benchmarks
⏩ 38 skipped benchmarks¹

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

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Memory	sort_long_line[160000]	724.5 KB	856.4 KB	-15.41%
⚡	Memory	sort_accented_data[500000]	25.5 MB	21.6 MB	+18.11%
⚡	Memory	sort_mixed_data[500000]	25.8 MB	22.4 MB	+15.24%
⚡	Memory	sort_numeric[500000]	48.7 MB	46 MB	+5.83%
⚡	Memory	sort_unique_locale[500000]	36.9 MB	33 MB	+11.83%
⚡	Memory	sort_key_field[500000]	32.8 MB	29.2 MB	+12.53%
⚡	Memory	sort_ascii_only[500000]	25.5 MB	21.9 MB	+16.7%
❌	Memory	dd_copy_partial	127.7 KB	132.1 KB	-3.29%

Footnotes

1. 38 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. ↩