Ticket 49185 - Fix leaks in compute init and dblayer
    
    Bug Description:  There were a number of leaks in compute_init
    and dblayer related to db2archive.
    
    Fix Description:  Resolve the leaks by fixing the free of of
    dblayer close, and the double init of compute.
    
    https://pagure.io/389-ds-base/issue/49185
    
    Author: wibrown
    
    Review by: mreynolds, tbordaz (Thanks!)