RFR: 8375738: Fix -Wzero-as-null-pointer-constant warnings in MacOSX/bsd code

[Kim Barrett]

On Tue, 20 Jan 2026 19:24:16 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

>> Please review this change to MacOSX and bsd code to avoid using literal zero
>> as a null pointer constant, instead using nullptr.
>> 
>> Also disable that warning when building the gtest framework with clang,
>> similarly to what was done in JDK-8338154 for gcc.
>> 
>> Testing: mach5 tier1.  Also tested with additional build changes to enable the
>> warning.
>
> Marked as reviewed by erikj (Reviewer).

Thanks for reviews @erikj79 and @dholmes-ora

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PR Comment: https://git.openjdk.org/jdk/pull/29329#issuecomment-3776351783