Bug 750625 - Fix Coverity (11113) Uninitialized pointer read
    
    https://bugzilla.redhat.com/show_bug.cgi?id=750625
    
    slapd/auditlog.c (write_audit_log_entry)
    
    Bug Description: Using uninitialized value "change" when
    calling "write_audit_file".
    If it is not a supported operation type, no need to log it
    in the audit log.
    
    Fix Description: Once it's determined as an unsupported
    operation type, return without calling write_audit_file.