[PATCH] JDK-8054565: FilterOutputStream.close may throw IOException if called twice and underlying flush or close fails

[Nathan Clement]

Hi,

Here is my suggested fix for the FilterOuputStream issue in JDK-8054565.  I 
have been running this fix in my applications for several weeks (by adding it 
to the bootstrap classpath) and it solves my issue.  The fix creates a new 
member field to remember whether close has already been called on the stream, 
and if so, close() does nothing.

Attached is the output from hg diff -g

This is my first attempt at a patch for OpenJDK, so please let me know if I 
need to change anything.

Thanks,

Nathan