[8u40] RFR: RT-39764: [macosx] Media crashes when changing EQ band center frequency

[David DeHaven]

I think Kirill's still out, Alexander can you review this?

-DrD-

> 
> Kevin, Kirill, please review my fix for RT-39764.
> 
> JIRA:
> https://javafx-jira.kenai.com/browse/RT-39764
> 
> Webrev:
> http://cr.openjdk.java.net/~ddehaven/RT-39764/rt.0/index.html
> 
> -DrD-
>