[Bug 738102] v4l2bufferpool: cleanly handle streamon failure for output device

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=738102
  GStreamer | gst-plugins-good | git

--- Comment #1 from Aurélien Zanelli <aurelien.zanelli at parrot.com> 2014-10-07 16:34:01 UTC ---
Created an attachment (id=287979)
 View: https://bugzilla.gnome.org/attachment.cgi?id=287979
 Review: https://bugzilla.gnome.org/review?bug=738102&attachment=287979

v4l2bufferpool: set pointers to NULL after some unref in finalize()

Just set some pointers to NULL after unref them.

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