Fix closingreason for checksum mismatch

src/connections.rs

@@ -292,7 +292,7 @@ impl<T: std::fmt::Debug + Clone + Serialize + DeserializeOwned + Send + Sync + '
                             Connection::from(
                                 *addr,
                                 ConnectionState::Closing(CloseReason::InvalidIdentifier(
-                                    identifier,
+                                    self.config.identifier.clone(),
                                 )),
                             ),
                         );