RFR: 8289763: Remove NULL check in CDSProtectionDomain::init_security_info()

[Ioi Lam]

On Wed, 6 Jul 2022 15:39:51 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

>> Please review this trivial clean up. I removed the unnecessary NULL check, and replaced the `CHECK_(pd)` with `CHECK_NH` to make the code cleaner.
>> 
>> It's easier to view the changes by ignoring whitespace differences.
>
> Marked as reviewed by ccheung (Reviewer).

Thanks @calvinccheung and @coleenp for the review

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PR: https://git.openjdk.org/jdk/pull/9380