qxl: add ring prep code for s/r
This prepare the ring code for s/r additions, the release ring will need
reinitialising.
Signed-off-by: NDave Airlie <airlied@redhat.com>
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This prepare the ring code for s/r additions, the release ring will need
reinitialising.
Signed-off-by: NDave Airlie <airlied@redhat.com>