C Client might not cleanup correctly during close

                 Key: ZOOKEEPER-898
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-898
             Project: Zookeeper
          Issue Type: Bug
          Components: c client
            Reporter: Jared Cantwell
            Priority: Trivial
         Attachments: ZOOKEEEPER-898.diff

I was looking through the c-client code and noticed a situation where a counter 
can be incorrectly incremented and a small memory leak can occur.

In zookeeper.c : add_completion(), if close_requested is true, then the 
completion will not be queued.  But at the end, outstanding_sync is still 
incremented and free() never called on the newly allocated completion_list_t.  

I will submit for review a diff that I believe corrects this issue.

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