NPE in the hudson logs, seems nioservercnxn closed twice
--------------------------------------------------------

                 Key: ZOOKEEPER-696
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-696
             Project: Zookeeper
          Issue Type: Bug
          Components: server
            Reporter: Patrick Hunt
            Priority: Blocker
             Fix For: 3.3.0


seeing the following on the console for 
http://hudson.zones.apache.org/hudson/view/ZooKeeper/job/ZooKeeper-trunk/729/

looks like the cnxn is closed twice? (the second time 'sock' is null). perhaps 
it's due to client closing and sending session term, then closing socket, 
server sees the read return -1, so closes cnxn, then sees the session close 
request (which was queued)?

    [junit] 2010-03-10 03:15:53,205 - INFO  [main:nioserverc...@1232] - Closed 
socket connection for client /127.0.0.1:41285 which had sessionid 
0x127461233fc0000
    [junit] 2010-03-10 03:15:53,206 - WARN  
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:11221:nioservercnxn$fact...@269] - 
Ignoring unexpected runtime exception
    [junit] java.lang.NullPointerException
    [junit]     at 
org.apache.zookeeper.server.NIOServerCnxn.close(NIOServerCnxn.java:1232)
    [junit]     at 
org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:594)
    [junit]     at 
org.apache.zookeeper.server.NIOServerCnxn$Factory.run(NIOServerCnxn.java:259)


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