RFR: 8337787: Fix -Wzero-as-null-pointer-constant warnings when JVMTI feature is disabled

[Kim Barrett]

On Mon, 5 Aug 2024 07:29:41 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Please review this trivial change that replaces some uses of literal 0 as a
>> null pointer constant when JVMTI is disabled to instead use nullptr.
>> 
>> Testing: mach5 tier1
>
> Marked as reviewed by ayang (Reviewer).

Thanks for reviews @albertnetymk and @sspitsyn

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PR Comment: https://git.openjdk.org/jdk/pull/20455#issuecomment-2269507346