RFR: 8342860: Fix more NULL usage backsliding [v2]

[Julian Waters]

On Tue, 5 Nov 2024 15:05:51 GMT, theoweidmannoracle <duke at openjdk.org> wrote:

>> - Changed several "NULL" in comments to "null"
>> - Changed several `NULL` in code to `nullptr`
>
> theoweidmannoracle has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
> 
>  - Merge branch 'openjdk:master' into JDK-8342860
>  - Fix copyright year
>  - 8342860: Fix more NULL usage backsliding

Marked as reviewed by jwaters (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/21826#pullrequestreview-2416030956