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[ Upstream commitcf8837d720] Unit testing this in VKMS shows that passing 0 into this function returns -1, which is highly counter- intuitive. Fix it by checking whether the input is >= 0 instead of > 0. Fixes:64566b5e76("drm: Add drm_fixp_from_fraction and drm_fixp2int_ceil") Signed-off-by: Harry Wentland <harry.wentland@amd.com> Reviewed-by: Simon Ser <contact@emersion.fr> Reviewed-by: Melissa Wen <mwen@igalia.com> Signed-off-by: Melissa Wen <melissa.srw@gmail.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231108163647.106853-2-harry.wentland@amd.com Signed-off-by: Sasha Levin <sashal@kernel.org>