git: openjdk/mobile: 8231921: (se) SelectorImpl.register does not need to set the attachment when it is null

[duke]

Changeset: 51e94d8d
Author:    Alan Bateman <alanb at openjdk.org>
Date:      2019-10-08 10:58:36 +0000
URL:       https://git.openjdk.java.net/mobile/commit/51e94d8d

8231921: (se) SelectorImpl.register does not need to set the attachment when it is null

Reviewed-by: bpb

! src/java.base/share/classes/java/nio/channels/SelectionKey.java
! src/java.base/share/classes/sun/nio/ch/SelectorImpl.java