[jdk15u-dev] RFR: 8285523: Improve test java/io/FileOutputStream/OpenNUL.java

[Sergey Bylokhov]

Hi all,
This pull request contains a backport of commit [f42631e3](https://github.com/openjdk/jdk/commit/f42631e354d4abf7994abd92aa5def6b2ceeab3a) from the [openjdk/jdk](https://git.openjdk.java.net/jdk) repository.
The commit being backported was authored by Sergey Bylokhov on 29 Apr 2022 and was reviewed by Andrew John Hughes and Brian Burkhalter.
Thanks!

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Commit messages:
 - Backport f42631e354d4abf7994abd92aa5def6b2ceeab3a

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/211/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=211&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8285523
  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/211.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/211/head:pull/211

PR: https://git.openjdk.java.net/jdk15u-dev/pull/211