[Bug 782774] kmssink: drop last rendered buffer on ALLOCATION and DRAIN queries

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=782774

--- Comment #18 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 355049
  --> https://bugzilla.gnome.org/attachment.cgi?id=355049&action=edit
kmssink: Don't leak GEM primed from DMABuf

This otherwise breaks DMABuf reclaiming. This is not visible from
userspace, but inside the kernel, the DRM driver will hold a ref to the
DMABuf object. With a V4L2 driver allocating those DMABuf, it then
prevent changing the resolution and re-allocation new buffers.

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