From 3417707e5e2079dd49aa9c5d5e426260a4887374 Mon Sep 17 00:00:00 2001
From: Max Inden <mail@max-inden.de>
Date: Thu, 29 Feb 2024 12:53:32 +0100
Subject: [PATCH] fix: feature flag Datagram::into_data

`Datagram::into_data` is used in `neqo_common::udp` only. `neqo_common::udp` is
behind the `udp` feature. The feature is not part of the crate's default
features. Thus a plain `cargo check` rightly complains with:

```
warning: method `into_data` is never used
  --> neqo-common/src/datagram.rs:58:19
   |
20 | impl Datagram {
   | ------------- method in this implementation
...
58 |     pub(crate) fn into_data(self) -> Vec<u8> {
   |                   ^^^^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default
```

This commit hides `into_data` behind the `udp` feature as well.
---
 neqo-common/src/datagram.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/neqo-common/src/datagram.rs b/neqo-common/src/datagram.rs
index d6ed43bde1..04ba1a45a1 100644
--- a/neqo-common/src/datagram.rs
+++ b/neqo-common/src/datagram.rs
@@ -54,6 +54,7 @@ impl Datagram {
         self.ttl
     }
 
+    #[cfg(feature = "udp")]
     #[must_use]
     pub(crate) fn into_data(self) -> Vec<u8> {
         self.d