fix(proto): floor negative echo lengths

crates/irtt-client/src/client/tests/support.rs

@@ -1,8 +1,8 @@
 use super::*;
+pub(crate) use irtt_proto::echo_packet_len;
 use irtt_proto::{
-    echo_packet_len as checked_echo_packet_len, encode_echo_reply, encode_open_reply,
-    flags::FLAG_OPEN, flags::FLAG_REPLY, layout::PacketLayout, Clock, EchoReply, OpenReply,
-    ReceivedStats, StampAt,
+    encode_echo_reply, encode_open_reply, flags::FLAG_OPEN, flags::FLAG_REPLY,
+    layout::PacketLayout, Clock, EchoReply, OpenReply, ReceivedStats, StampAt,
 };
 use std::{
     net::UdpSocket,
@@ -72,11 +72,6 @@ pub(super) fn open_reply(
     .unwrap()
 }
 
-pub(crate) fn echo_packet_len(hmac: bool, params: &Params) -> usize {
-    checked_echo_packet_len(hmac, params)
-        .expect("test params must have a non-negative packet length")
-}
-
 pub(super) fn echo_reply_packet(
     token: u64,
     seq: u32,