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

[alan.bateman at oracle.com]

Changeset: 7f34de3cdfe9
Author:    alanb
Date:      2019-10-08 10:58 +0100
URL:       https://hg.openjdk.java.net/jdk/submit/rev/7f34de3cdfe9

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