appsink: fix missing return nullability g-i annotations
This commit fixes the annoations for return nullability on several GstAppSink functions. This was causing bindings to be generated incorrectly.
Fixes #914 (closed)
Edited by Tim-Philipp Müller
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This commit fixes the annoations for return nullability on several GstAppSink functions. This was causing bindings to be generated incorrectly.
Fixes #914 (closed)