RFR: Remove unnecessary checks identified by reviewer

[William Kemper]

On Fri, 24 Jun 2022 19:38:33 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

> A previous pull request was integrated before all of the reviewer
> comments had been addressed.  This commit addresses the lingering
> request.

Thanks for the update

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Marked as reviewed by wkemper (Committer).

PR: https://git.openjdk.org/shenandoah/pull/146