modesetting: Drop dumb_bo::map_count field and dead unmap code.
The drm kernel API for dumb BOs apparently doesn't include an unmap ioctl, so we can't do much here. It looks like this code was copied from libkms, which was also unfinished. We may as well delete the dead variable that simply gets incremented and never read. Signed-off-by: Kenneth Graunke <email@example.com> Tested-by: Jason Ekstrand <firstname.lastname@example.org> Reviewed-by: Keith Packard <email@example.com>
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