Bug 750625 - Fix Coverity (11114, 11115) Uninitialized value use
    
    https://bugzilla.redhat.com/show_bug.cgi?id=750625
    
    slapd/back-ldbm/ancestorid.c (ldbm_ancestorid_index_update)
    
    Bug Description: Uninitialized "sdn" and "nextsdn" when calling
    "slapi_sdn_done".
    Variable "sdn" and "nextsdn" should have been initialized before
    any chances to goto "out".
    
    Fix Description: initialize "sdn" and "nextsdn" before the first
    "goto out".