drm/radeon/kms: drop zero length CS indirect buffers.
If userspace sends a zero length IB, it really shouldn't have bothered
so EINVAL it.
Signed-off-by: 
Dave Airlie <airlied@redhat.com>
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If userspace sends a zero length IB, it really shouldn't have bothered
so EINVAL it.
Signed-off-by: Dave Airlie <airlied@redhat.com>