[Bug 787593] kmssink: Export DMABuf

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=787593

--- Comment #23 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 361061
  --> https://bugzilla.gnome.org/attachment.cgi?id=361061&action=edit
kmssink: Fix crash on NULL dmabuf allocator pointer

Now that we are doing lazy allocation, we may endup calling _stop()
before the allocator was created. As a side effect, we need to nul-check
the pointer before calling it's method (_clear_cache()).

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