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

[Kim Barrett]

On Thu, 7 Nov 2024 08:32:16 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 incrementally with one additional commit since the last revision:
> 
>   Fix backslides in test

Looks good.

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.

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Marked as reviewed by kbarrett (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/21826#pullrequestreview-2421831752