virtio-gpu: skip update cursor in post_load if we don't have one
If the cursor resource id isn't set the guest didn't define a cursor. Skip the cursor update in post_load in that that case. Reported-by: Nwanghaibin <wanghaibin.wang@huawei.com> Signed-off-by: NGerd Hoffmann <kraxel@redhat.com> Tested-by: Nwanghaibin <wanghaibin.wang@huawei.com> Message-id: 20170710070432.856-1-kraxel@redhat.com Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
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