hg: jdk7/tl/jdk: 6527572: (cs) Charset.forName can throw NullPointerException when testing bug level

[xueming.shen at oracle.com]

Changeset: 01b6d147db50
Author:    sherman
Date:      2010-12-08 12:15 -0800
URL:       http://hg.openjdk.java.net/jdk7/tl/jdk/rev/01b6d147db50

6527572: (cs) Charset.forName can throw NullPointerException when testing bug level
Summary: fixed the race condition
Reviewed-by: alanb

! src/share/classes/java/nio/charset/Charset.java