RFR: 8281626: NonblockingQueue should use nullptr

[David Holmes]

On Fri, 11 Feb 2022 05:37:27 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this change to use nullptr instead of NULL throughout the NonblockingQueue class.
> 
> Testing:
> mach5 tier1

Looks good and trivial.

Thanks,
David

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Marked as reviewed by dholmes (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/7438