[Bug 708789] New: playbin: make sure elements are in null before disposing

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=708789
  GStreamer | gst-plugins-base | unspecified

           Summary: playbin: make sure elements are in null before
                    disposing
    Classification: Platform
           Product: GStreamer
           Version: unspecified
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: thiago.sousa.santos at collabora.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


It is quite common to see messages of elements being disposed in READY.
Specially happens when pipelines fail when prerolling. I tracked those down
to a particular unref in the group deactivation.

Putting the patch here for review in case there is a reason not to force it
to null when unreffing. Maybe if the sink was set externally there is some
use case that we should keep it in non-null?

* Can't think of any, but I'd like someone to look at this before pushing.

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