mkfifo: do not change permission when failed to create

[w007878]

resolves #10319

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/tail/follow-name (fails in this run but passes in the 'main' branch)
Congrats! The gnu test tests/dd/stderr is no longer failing!
Congrats! The gnu test tests/tac/tac-2-nonseekable is no longer failing!
Congrats! The gnu test tests/tail/follow-stdin is no longer failing!

[codspeed-hq]

CodSpeed Performance Report

Merging this PR will improve performance by 19.47%

_{Comparing w007878:fix/mkfifo-continue (b09480f) with main (56cf70d)}

Summary

⚡ 2 improved benchmarks
✅ 280 untouched benchmarks
⏩ 38 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Memory	ls_recursive_long_all_mixed_tree	306 KB	292.7 KB	+4.54%
⚡	Memory	ls_recursive_balanced_tree[(6, 4, 15)]	1.7 MB	1.4 MB	+19.47%

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:

Skip an intermittent issue tests/tail/follow-name (fails in this run but passes in the 'main' branch)
Congrats! The gnu test tests/dd/stderr is no longer failing!
Congrats! The gnu test tests/tac/tac-2-nonseekable is no longer failing!
Congrats! The gnu test tests/tail/follow-stdin is no longer failing!