RFR: 8258422: Cleanup unnecessary null comparison before instanceof check in java.base

Mon Jan 11 23:47:07 UTC 2021

On Mon, 11 Jan 2021 23:29:53 GMT, Aleksei Efimov <aefimov at openjdk.org> wrote:

>> @AlekseiEfimov `HttpClientImpl` is not in `java.base` module. So I think it's better to not touch it under this PR.
>
> To double check that docs build will be stable after integration the following actions have been performed:
> - The pull request branch was locally synced-up with the latest changes from `master` (`JDK-8258657` is part of them)
> - Verified that local  `docs-reference-api-javadoc` build completes successfully

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PR: https://git.openjdk.java.net/jdk/pull/20