fix: uptime > /dev/full panic fix

[hlsxx]

Fix for #10814 + uptime_test added test /dev/full

[oech3]

Would you cargo fmt?

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/pr/bounded-memory. tests/pr/bounded-memory is passing on 'main'. Maybe you have to rebase?
Skip an intermittent issue tests/misc/usage_vs_getopt (fails in this run but passes in the 'main' branch)

[codspeed-hq]

Merging this PR will not alter performance

✅ 284 untouched benchmarks
⏩ 38 skipped benchmarks¹

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_{Comparing hlsxx:uptime-panic-dev-full (2dbb938) with main (194d980)}

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. ↩

[github-actions]

GNU testsuite comparison:

Congrats! The gnu test tests/tail/tail-n0f is now passing!