hg: dio/dev: 8072410: SPIDevice doesn't check buffer for NULL

[sergey.nazarkin at oracle.com]

Changeset: eca473967edd
Author:    snazarki
Date:      2015-02-04 13:28 +0400
URL:       http://hg.openjdk.java.net/dio/dev/rev/eca473967edd

8072410: SPIDevice doesn't check buffer for NULL
Summary: Restored buffer check at public functions calls.
Reviewed-by: alkonsta

! src/share/classes/com/oracle/dio/spibus/impl/SPISlaveImpl.java