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gst-launch: go back down to GST_STATE_NULL in one step.

Mathieu Duponchelle requested to merge meh/gstreamer:gst-launch-fix-teardown into master

Going through each state on the way back down to GST_STATE_NULL can cause deadlocks, for example:

gst-launch-1.0 audiotestsrc ! valve drop=true ! autoaudiosink

ctrl + C

Hangs forever when going to PAUSED, because the "final" state is ASYNC, and the sink blocks waiting for a preroll buffer.

Going straight to NULL addresses this issue, and also helps making teardown faster when piping sparse streams to a sync sink.

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