Ticket #47876 - coverity defects in slapd/tools/mmldif.c
    
    Fix Description:
    Defect type: CLANG_WARNING
    1. ldap/servers/slapd/tools/mmldif.c:1404:5:warning Value stored to 'att' is never read
       Removed unnecessary att initialization.
    2. ldap/servers/slapd/tools/mmldif.c:1322:5:warning Value stored to 'rc' is never read
       Removed unnecessary rc assignment.
    3. ldap/servers/slapd/tools/mmldif.c:1148:25:warning Access to field 'next' results in a dereference of a null pointer (loaded from variable 'a')
       false positive.
       (cmp < 0) means 'a' is not NULL.
    4. ldap/servers/slapd/tools/mmldif.c:522:9:warning Value stored to 'count' is never read
       Removed unused count.
    5. ldap/servers/slapd/tools/mmldif.c:518:9:warning Value stored to 'pmask' is never read
       Removed unused pmask.
    6. ldap/servers/slapd/tools/mmldif.c:517:9:warning Value stored to 'pindex' is never read
       Removed unused pindex.
    7. ldap/servers/slapd/tools/mmldif.c:447:9:warning Value stored to 'pmask' is never read
       Removed unused pmask.
    8. ldap/servers/slapd/tools/mmldif.c:446:9:warning Value stored to 'pindex' is never read
       Removed unused pindex.
    
    https://fedorahosted.org/389/ticket/47876
    
    Reviewed by tbordaz@redhat.com (Thank you Thierry!!)