drm/msm: fix fb references in async update
commit 474d952b4870cfbdc55d3498f4d498775fe77e81 upstream. Async update callbacks are expected to set the old_fb in the new_state so prepare/cleanup framebuffers are balanced. Cc: <stable@vger.kernel.org> # v4.14+ Fixes: 224a4c97 ("drm/msm: update cursors asynchronously through atomic") Suggested-by: NBoris Brezillon <boris.brezillon@collabora.com> Signed-off-by: NHelen Koike <helen.koike@collabora.com> Acked-by: NRob Clark <robdclark@gmail.com> Signed-off-by: NBoris Brezillon <boris.brezillon@collabora.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190603165610.24614-4-helen.koike@collabora.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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