[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 #6 from Aurélien Zanelli <aurelien.zanelli at parrot.com> 2014-10-08 12:13:12 UTC ---
Created an attachment (id=288037)
 View: https://bugzilla.gnome.org/attachment.cgi?id=288037
 Review: https://bugzilla.gnome.org/review?bug=738102&attachment=288037

v4l2bufferpool: check that allocator is non null when stopping pool

Otherwise, we could dereference NULL allocator when the stop method is called
by the GstBufferPool finalize method.

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