Ticket #47623 fix memleak caused by 47347
    
    https://fedorahosted.org/389/ticket/47623
    Reviewed by: tbordaz, nhosoi (Thanks!)
    Branch: 389-ds-base-1.2.11
    Fix Description: Create the mutex if it doesn't exist.
    Platforms tested: RHEL6 x86_64
    Flag Day: no
    Doc impact: no
    (cherry picked from commit 0d4849dd7551347f0e24ac1027f4d0501084dcf3)
    (cherry picked from commit 5d3ae5f709964cd7dfb73b631a22389223f5ef25)
    (cherry picked from commit 5c649ddacd1d2c11b6e922b29472094b780c2a0e)
    (cherry picked from commit 75ed4b36722eeff8dc2d6aad0cf5e32dc474c3a7)