Backport of "rtsp-media: Only unprepare a media if it was not already unpreparing anyway" into 1.18
requested to merge tpm/gst-rtsp-server:backport-mr-1083-into-1.18-rtsp-server-unprepare-only-when-not-unpreparing into 1.18
Backport of gstreamer!1083 (merged) "rtsp-media: Only unprepare a media if it was not already unpreparing anyway".
Commits:
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e9d551b4rtsp-media: Only unprepare a media if it was not already unpreparing anyway