RFR: JDK-8297414: Remove easy warnings in javafx.controls [v3]

[John Hendrikx]

On Wed, 23 Nov 2022 22:00:16 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

>> Yes, good catch, fixed.
>
> Eclipse's quick fix is to replace the `instanceof` check with a `null` check, did it not suggest the same for you?

I was to quick on the trigger and removed it myself, not Eclipse fault.

-------------

PR: https://git.openjdk.org/jfx/pull/959