Backport of "videotestsrc: Fix a leak when computing alpha caps" into 1.18
Backport of !1131 (merged) "videotestsrc: Fix a leak when computing alpha caps".
Commits:
- b1434704 videotestsrc: Fix a leak when computing alpha caps
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Backport of !1131 (merged) "videotestsrc: Fix a leak when computing alpha caps".
Commits: