Jason Wang 2a83e97ee8 vhost-vdpa: correctly return err in vhost_vdpa_set_backend_cap()
We should return error code instead of zero, otherwise there's no way
for the caller to detect the failure.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20210903091031.47303-3-jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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