[Bug 728490] New: v4l2src: Missing unref in decide_allocation

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=728490
  GStreamer | gst-plugins-good | 1.2.3

           Summary: v4l2src: Missing unref in decide_allocation
    Classification: Platform
           Product: GStreamer
           Version: 1.2.3
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: aurelien.zanelli at parrot.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=274659)
 View: https://bugzilla.gnome.org/attachment.cgi?id=274659
 Review: https://bugzilla.gnome.org/review?bug=728490&attachment=274659

v4l2src: unref given pool before replacing it

v4l2src decide_allocation function doesn't unref pool provided by downstream
element before replacing it by its own pool.
This bug is not present on master. Only on 1.2 branch

I attached a patch which fix it

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