Revert clippy fix

Box is not an iter

ntpd/src/daemon/keyexchange.rs

@@ -924,7 +924,7 @@ mod tests {
 
     fn client_key_exchange_message_length() -> usize {
         let mut buffer = Vec::with_capacity(1024);
-        for record in &ntp_proto::NtsRecord::client_key_exchange_records(vec![]) {
+        for record in ntp_proto::NtsRecord::client_key_exchange_records(vec![]).iter() {
             record.write(&mut buffer).unwrap();
         }