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nvenc: Early terminate handle_frame if the last flow was not GST_FLOW_OK

Seungha Yang requested to merge seungha.yang/gst-plugins-bad:fix-nvenc-deadlock into master

If the last flow was not GST_FLOW_OK, the encoding thread is not running and there is nothing to pop from GAsyncQueue (this causes deadlock).

To prevent deadlock, just return the handle_frame without further encoding process if the last flow was not GST_FLOW_OK. Note that the last flow will be cleared per FLUSH_STOP and STREAM_START event.

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