RFR: 8342860: Fix more NULL usage backsliding

[Sonia Zaldana Calles]

On Fri, 1 Nov 2024 13:35:56 GMT, theoweidmannoracle <duke at openjdk.org> wrote:

> - Changed several "NULL" in comments to "null"
> - Changed several `NULL` in code to `nullptr`

Hi @theoweidmannoracle, I think the GHA tests are not running because you haven't enabled GHA on your personal fork. See https://wiki.openjdk.org/display/SKARA/Testing for a bit more info.

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PR Comment: https://git.openjdk.org/jdk/pull/21826#issuecomment-2457309128