RFR: 8337784: Fix simple -Wzero-as-null-pointer-constant warnings in linux/posix code

[Stefan Karlsson]

On Sat, 3 Aug 2024 21:23:53 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this trivial change that replaces some uses of literal 0 as a
> null pointer constant in linux/posix code to instead use nullptr.
> 
> Testing: mach5 tier1

Marked as reviewed by stefank (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/20452#pullrequestreview-2218191373