Bug 604453 - SASL Stress and Server crash: Program quits with the assertion failure in PR_Poll
    
    https://bugzilla.redhat.com/show_bug.cgi?id=604453
    Resolves: bug 604453
    Description: SASL Stress and Server crash: Program quits with the assertion failure in PR_Poll
    Reviewed by:
    Fix Description: We usually do not have to pop the IO layer from the SASL
    connection.  This is usually handled by PR_Close() on the PRFD, which should
    only happen when the connection is not being referenced by the main PR_Poll()
    call.  The only time we need to explicitly pop the SASL IO layer is if the
    client re-negotiates the SASL bind with a different ssf e.g. going from
    clear to protected or vice versa.
    Platforms tested: RHEL5 x86_64