drm/tinydrm: Fix setting of the column/page end addresses.
If the clipped dirty region's x/y happened to align to 256, we would have set the top 8 bits wrong. Noticed by inspection, not by reproducing a bug. Signed-off-by: Eric Anholt <eric@anholt.net> Link: https://patchwork.freedesktop.org/patch/msgid/20181024184313.2967-4-eric@anholt.netReviewed-by: Noralf Trønnes <noralf@tronnes.org>
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