[9] Review request for 8081019 Check peer to null in CPlatformWindow.checkZoom() method

[Alexander Scherbatiy]

Hello,

Could you review the fix:
  bug: https://bugs.openjdk.java.net/browse/JDK-8081019
  webrev: http://cr.openjdk.java.net/~alexsch/8081019/webrev.00

  Peer is checked to null in the checkZoom() method.

Thanks,
Alexandr.