convert ipv4-mapped nexthops to ipv4

Author: yuyuyureka

src/api.rs

@@ -256,6 +256,7 @@ async fn query<T: Store>(
             ))));
 
             if let Some(nexthop) = route.attrs.nexthop {
+                let nexthop = nexthop.to_canonical();
                 if have_resolved.insert(nexthop) {
                     let resolver = resolver.clone();
                     futures.push(Box::pin(async move {