vdpasim: Return status in vdpasim_get_status

vdpasim->status should acquired under spin lock.

Fixes: 870448c31775 ("vdpasim: vDPA device simulator")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20200402024916.35192-1-yuehaibing@huawei.comSigned-off-by: Michael S. Tsirkin <mst@redhat.com>

drivers/vdpa/vdpa_sim/vdpa_sim.c

@@ -488,7 +488,7 @@ static u8 vdpasim_get_status(struct vdpa_device *vdpa)
 	status = vdpasim->status;
 	spin_unlock(&vdpasim->lock);
 
-	return vdpasim->status;
+	return status;
 }
 
 static void vdpasim_set_status(struct vdpa_device *vdpa, u8 status)