Bug 750625 - Fix Coverity (11058, 11059) Dereference null return value
    
    https://bugzilla.redhat.com/show_bug.cgi?id=750625
    
    plugins/referint/referint.c (_update_one_per_mod, _update_all_per_mod)
    
    Bug Description: Dereferencing a null pointer "dnParts".
    Missing a check of the NULL possibilities for origDN and exploded origDN.
    
    Fix Description: check if origDN and dnParts are NULL or not.
    If NULL, it does not go forward, but goto bail.