hg: jdk/sandbox: 8204930: Reader:nullReader() spec does not match the behavior

[chris.hegarty at oracle.com]

Changeset: c545db4fc9bd
Author:    bpb
Date:      2018-06-25 14:36 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/c545db4fc9bd

8204930: Reader:nullReader() spec does not match the behavior
Reviewed-by: bpb, rriggs
Contributed-by: Patrick Reinhart <patrick at reini.net>

! src/java.base/share/classes/java/io/Reader.java
! test/jdk/java/io/Reader/NullReader.java