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d3d11videosink: Clear cached buffer on GstBaseSink::unlock_stop()

Seungha Yang requested to merge seungha.yang/gst-plugins-bad:d3d11-clear-cached-buffer into master

Since GstBaseSink::unlock() will not be protected by lock, concurrent access to the cached buffer might be possible, for example one is from streaming thread and the other is from application thread for state change or so.

(gst-launch-1.0:25052): CRITICAL **: 21:12:50.899: gst_d3d11_overlay_compositor_upload: assertion 'GST_IS_BUFFER (buf)' failed

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