RFR: 8342860: Fix more NULL usage backsliding [v3]

[Kim Barrett]

On Thu, 7 Nov 2024 18:31:51 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> The grep results are exactly as expected. Thanks for checking that. Now if we can just get the build to start checking for us, we can stop needing these periodic cleanups. I forget whether a JBS issue has been filed for that. If not, I will do so.

II've filed these followup issues:
https://bugs.openjdk.org/browse/JDK-8343802 Prevent NULL usage backsliding
https://bugs.openjdk.org/browse/JDK-8343800 Cleanup definition of NULL_WORD
https://bugs.openjdk.org/browse/JDK-8343801 Change string printed by nsk_null_string for null strings

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PR Comment: https://git.openjdk.org/jdk/pull/21826#issuecomment-2463290137