RFR: 8274640: Cleanup unnecessary null comparison before instanceof check in java.desktop [v2]

[Alexey Ivanov]

On Mon, 29 Nov 2021 08:17:41 GMT, Andrey Turbanov <duke at openjdk.java.net> wrote:

>> Updated code checks both non-null and instance of a class in java.desktop module classes.
>> The checks and explicit casts could also be replaced with pattern matching for the instanceof operator. 
>> Similar cleanups
>> 1. [JDK-8273484](https://bugs.openjdk.java.net/browse/JDK-8273484) java.naming
>> 2. [JDK-8258422](https://bugs.openjdk.java.net/browse/JDK-8258422) java.base
>
> Andrey Turbanov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8274640: Cleanup unnecessary null comparison before instanceof check in java.desktop
>   apply review comments

Marked as reviewed by aivanov (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/5482