Simplify weirdly broken test code

Author: djc

quinn-proto/src/tests/mod.rs

@@ -1635,9 +1635,10 @@ fn cid_retirement() {
     pair.drive();
     assert!(!pair.client_conn_mut(client_ch).is_closed());
     assert!(!pair.server_conn_mut(server_ch).is_closed());
-    assert_matches!(
+
+    assert_eq!(
         pair.client_conn_mut(client_ch).active_rem_cid_seq(),
-        _next_retire_prior_to
+        next_retire_prior_to,
     );
 }