bin: Use from_glib_none() in Bin::add() for subclasses
This way we take ownership of any floating references passed in here, as required by the GstBin API, instead of just borrowing the reference and having someone else sink it or not.
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This way we take ownership of any floating references passed in here, as required by the GstBin API, instead of just borrowing the reference and having someone else sink it or not.