[Bug 734764] New: Videomixer: Avoid double free of videoconvert

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=734764
  GStreamer | gst-plugins-good | git

           Summary: Videomixer: Avoid double free of videoconvert
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: ravi.kiran at samsung.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=283347)
 View: https://bugzilla.gnome.org/attachment.cgi?id=283347
 Review: https://bugzilla.gnome.org/review?bug=734764&attachment=283347

Assign NULL to avoid double free

There is double free in videomixer when it unloads.
Message "*** double free or corruption (!prev): 0xb23afb00 ***" is displayed at
the end of pipeline using videomixer element.

Attached patch will fix the issue.

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