RFR: JDK-8297332: Remove easy warnings in base

Mon Nov 21 20:46:09 UTC 2022

On Mon, 21 Nov 2022 20:42:51 GMT, John Hendrikx <jhendrikx at openjdk.org> wrote:

>> many of those ^^ appear to be bugs.
>
> I didn't fix all problems, only the easy non-controversial ones.  Things that might actually be bugs require more careful review and so are best saved for smaller PR's IMHO.
> 
> This is already fixing around 2000 warnings in 250 files, and before going in even deeper I'd like to see if this will actually get accepted into JavaFX in a reasonable time frame (PR's changing large numbers of files don't age well).

I only fixed the warnings listed in the ticket :)

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PR: https://git.openjdk.org/jfx/pull/957