memory_region_register_iommu_notifier now returns an error
in case of failure. Assert in such a case.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
 hw/virtio/vhost.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 34accdf615..9b5551fc4d 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -696,7 +696,7 @@ static void vhost_iommu_region_add(MemoryListener *listener,
     iommu->iommu_offset = section->offset_within_address_space -
                           section->offset_within_region;
     iommu->hdev = dev;
-    memory_region_register_iommu_notifier(section->mr, &iommu->n);
+    assert(!memory_region_register_iommu_notifier(section->mr, &iommu->n));
     QLIST_INSERT_HEAD(&dev->iommu_list, iommu, iommu_next);
     /* TODO: can replay help performance here? */
 }
-- 
2.20.1