hg: jdk/sandbox: JDK-8238770-branch: null handling and tests

[chris.hegarty at oracle.com]

Changeset: 17c6ea2dfe3f
Author:    chegar
Date:      2020-04-24 16:29 +0100
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/17c6ea2dfe3f

JDK-8238770-branch: null handling and tests

! src/java.base/share/classes/java/nio/channels/ServerSocketChannel.java
! src/java.base/share/classes/java/nio/channels/SocketChannel.java
! test/jdk/java/nio/channels/ProtocolFamilies.java