RFR: 8318383: Remove duplicated checks in os::get_native_stack() in posix implemenation

[David Holmes]

On Wed, 18 Oct 2023 00:05:11 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> Trivial cleanup that removes duplicated checkings.

Took me a few minutes to convince myself but looks good. :)

Thanks

Please fix the typo in JBS and PR title: implemenation -> implementation

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Marked as reviewed by dholmes (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/16232#pullrequestreview-1684034250
PR Comment: https://git.openjdk.org/jdk/pull/16232#issuecomment-1767656510