Backport of "waylandsink: free staged buffer when do gst_wl_window_finalize" into 1.24
requested to merge gstreamer-backport-bot/gstreamer:mr-6670-backport-into-1.24-fix-memory-leak into 1.24
Backport of !6670 (merged) "waylandsink: free staged buffer when do gst_wl_window_finalize".
Commits:
- be7ba5ac wlwindow: free staged buffer when do gst_wl_window_finalize