RFR: 8201570: Get two bytes for the Linux input event type, not four

Wed Jul 1 12:13:36 UTC 2020

On Mon, 29 Jun 2020 11:31:41 GMT, Johan Vos <jvos at openjdk.org> wrote:

>> Fixes [JDK-8201570](https://bugs.openjdk.java.net/browse/JDK-8201570).
>
> This fixes a bug that currently didn't cause any harm
> (https://bugs.openjdk.java.net/browse/JDK-8201570?focusedCommentId=14172176) , but it's better to fix it now.

@jgneff you can proceed with this and integrate it. Once you do that, I'll sponsor the commit.

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PR: https://git.openjdk.java.net/jfx/pull/257