Ticket 49529 - Fix Coverity warnings: invalid deferences
    
    Description:  So many of the warnings were false positives, but
                  I "fixed" 90% of them anyway for these two reasons:
    
                  One, it's possible that a future change could actually
                  result in a NULL pointer being referenced.
    
                  Two, it would be nice to stop these coverity warnings
                  so we can focus on real warnings.  Auto waivers also
                  don't always work as the surrounding code changes.
    
    https://pagure.io/389-ds-base/issue/49529
    
    Reviewed by: firstyear (Thanks!)