RFR: 8350771: Fix -Wzero-as-null-pointer-constant warning in nsk/monitoring ThreadController utility

[Kim Barrett]

On Tue, 4 Mar 2025 04:20:20 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Please review this trivial change to remove a use of literal zero as a null
>> pointer constant in an nsk test utility.
>> 
>> Testing: mach5 tier1
>> Locally tested (linux-x64) with -Wzero-as-null-pointer-constant enabled to
>> verify the warnings associated with this code were removed.
>
> Looks good and trivial. Thanks

Thanks for reviewing @dholmes-ora

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PR Comment: https://git.openjdk.org/jdk/pull/23800#issuecomment-2696158201