Backport of "gst-launch: go back down to GST_STATE_NULL in one step." into 1.16
Backport of !423 (merged) "gst-launch: go back down to GST_STATE_NULL in one step.".
Commits:
- c682579c gst-launch: go back down to GST_STATE_NULL in one step.
Edited by Tim-Philipp Müller