Ticket #47750 - Creating a glue fails if one above level is a conflict or missing
    
    Description: This commit accidentally removed the code to decrementing
    the reference count for the backend instance.
      Commit: 160cb3f686e433c01532d28770b2977ec957e73e
      Ticket #47750 - Creating a glue fails if one above level is a conflict or missing;
    Thanks to mreynolds@redhat.com for finding this out.