RFR: 8344917: Fix recent NULL usage backsliding

[Johan Sjölen]

On Sun, 24 Nov 2024 11:26:25 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this trivial fix of some recently introduced uses of NULL in HotSpot.
> 
> Testing:
> mach5 tier1
> GHA sanity tests

LGTM and trivial

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Marked as reviewed by jsjolen (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/22348#pullrequestreview-2456692829