Backport of "Fix gst_promise_new_with_change_func" into 1.16
Backport of !11 (merged) "Fix gst_promise_new_with_change_func".
Commits:
- a7ac9ee4 Fix gst_promise_new_with_change_func
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Backport of !11 (merged) "Fix gst_promise_new_with_change_func".
Commits: