hg: dio/dev: 8081697: Runtime crash on some DIO VTS UART tests

[sergey.nazarkin at oracle.com]

Changeset: 3e30ad0fc940
Author:    snazarki
Date:      2015-06-02 18:05 +0300
URL:       http://hg.openjdk.java.net/dio/dev/rev/3e30ad0fc940

8081697: Runtime crash on some DIO VTS UART tests
Summary: Added device check prior to some function execution
Reviewed-by: alkonsta

! src/share/classes/com/oracle/dio/uart/impl/UARTImpl.java