Backport of "gst-play: Don't leak the stream collection" into 1.20
Backport of !3186 (merged) "gst-play: Don't leak the stream collection".
Commits:
- ece84d69 gst-play: Don't leak the stream collection
Backport of !3186 (merged) "gst-play: Don't leak the stream collection".
Commits: