RFR: 8344917: Fix recent NULL usage backsliding

[Kim Barrett]

On Sun, 24 Nov 2024 11:57:06 GMT, Johan Sjölen <jsjolen 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

Thanks for review @jdksjolen

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PR Comment: https://git.openjdk.org/jdk/pull/22348#issuecomment-2496112663