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We'll soon introduce another completion callback source that won't need to use the BO reference counting, so let's move it around to create a function we will be able to share between both callbacks. Reviewed-by: Melissa Wen <mwen@igalia.com> Signed-off-by: Maxime Ripard <maxime@cerno.tech> Link: https://lore.kernel.org/r/20220610115149.964394-11-maxime@cerno.tech