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The container error integer field is currently used to store the first error potentially encountered during any vfio_listener_region_add() call. However this fails to propagate detailed error messages up to the vfio_connect_container caller. Instead of using an integer, let's use an Error handle. Messages are slightly reworded to accomodate the propagation. Signed-off-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>