chore: fix clippy lints

will address the intra doc links issue on a subsequent PR, the remaining [issue](https://github.com/libp2p/rust-libp2p/actions/runs/19040315461/job/54375441096?pr=6195#step:6:760) seems like a bug, opened rust-lang/rust-clippy#16023.

Pull-Request: #6195.

Author: jxs

protocols/dcutr/src/handler/relayed.rs

@@ -148,12 +148,8 @@ impl Handler {
 
     fn on_listen_upgrade_error(
         &mut self,
-        ListenUpgradeError { error, .. }: ListenUpgradeError<
-            (),
-            <Self as ConnectionHandler>::InboundProtocol,
-        >,
+        _: ListenUpgradeError<(), <Self as ConnectionHandler>::InboundProtocol>,
     ) {
-        libp2p_core::util::unreachable(error.into_inner());
     }
 
     fn on_dial_upgrade_error(

protocols/identify/src/handler.rs

@@ -430,6 +430,7 @@ impl ConnectionHandler for Handler {
             ConnectionEvent::DialUpgradeError(DialUpgradeError { error, .. }) => {
                 self.events.push(ConnectionHandlerEvent::NotifyBehaviour(
                     Event::IdentificationError(
+                        #[allow(unused)]
                         error.map_upgrade_err(|e| libp2p_core::util::unreachable(e.into_inner())),
                     ),
                 ));

swarm/tests/swarm_derive.rs

@@ -84,8 +84,8 @@ fn two_fields() {
         let _out_event: <Foo as NetworkBehaviour>::ToSwarm = unimplemented!();
         match _out_event {
             FooEvent::Ping(ping::Event { .. }) => {}
-            FooEvent::Identify(event) => {
-                let _: identify::Event = event;
+            FooEvent::Identify(_event) => {
+                let _: identify::Event = _event;
             }
         }
     }
@@ -112,11 +112,11 @@ fn three_fields() {
         let _out_event: <Foo as NetworkBehaviour>::ToSwarm = unimplemented!();
         match _out_event {
             FooEvent::Ping(ping::Event { .. }) => {}
-            FooEvent::Identify(event) => {
-                let _: identify::Event = event;
+            FooEvent::Identify(_event) => {
+                let _: identify::Event = _event;
             }
-            FooEvent::Kad(event) => {
-                let _: libp2p_kad::Event = event;
+            FooEvent::Kad(_event) => {
+                let _: libp2p_kad::Event = _event;
             }
         }
     }