[jdk21u-dev] RFR: 8334332: TestIOException.java fails if run by root

[SendaoYan]

Hi all,

This pull request contains a backport of commit [472b935b](https://github.com/openjdk/jdk/commit/472b935b442f7f925b665c7de91eda77f3dcbe8b) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by SendaoYan on 18 Jun 2024 and was reviewed by Pavel Rappo.

Only change test testcase, no risk.

Thanks!

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Commit messages:
 - Backport 472b935b442f7f925b665c7de91eda77f3dcbe8b

Changes: https://git.openjdk.org/jdk21u-dev/pull/742/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=742&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8334332
  Stats: 43 lines in 1 file changed: 2 ins; 24 del; 17 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/742.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/742/head:pull/742

PR: https://git.openjdk.org/jdk21u-dev/pull/742