drm/ttm: Fix memory type compatibility check
Also check the busy placements before deciding to move a buffer object. Failing to do this may result in a completely unneccessary move within a single memory type. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Jakob Bornecrantz <jakob@vmware.com> Cc: stable@vger.kernel.org
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