*: Fix clippy warnings (#2227)

swarm/src/behaviour.rs

@@ -675,7 +675,7 @@ where
             } => NetworkBehaviourAction::NotifyHandler {
                 peer_id,
                 handler,
-                event: event,
+                event,
             },
             NetworkBehaviourAction::ReportObservedAddr { address, score } => {
                 NetworkBehaviourAction::ReportObservedAddr { address, score }

swarm/src/lib.rs

@@ -333,7 +333,7 @@ where
     pub fn dial_addr(&mut self, addr: Multiaddr) -> Result<(), DialError> {
         let handler = self.behaviour.new_handler();
         self.dial_addr_with_handler(addr, handler)
-            .map_err(|e| DialError::from_network_dial_error(e))
+            .map_err(DialError::from_network_dial_error)
             .map_err(|(e, _)| e)
     }
 
@@ -392,7 +392,7 @@ where
             Err(error) => {
                 let (error, handler) = DialError::from_network_dial_error(error);
                 self.behaviour.inject_dial_failure(
-                    &peer_id,
+                    peer_id,
                     handler.into_protocols_handler(),
                     error.clone(),
                 );
@@ -1051,7 +1051,7 @@ impl<'a> PollParameters for SwarmPollParameters<'a> {
     }
 
     fn local_peer_id(&self) -> &PeerId {
-        &self.local_peer_id
+        self.local_peer_id
     }
 }
 

swarm/src/protocols_handler.rs

@@ -523,10 +523,7 @@ pub enum KeepAlive {
 impl KeepAlive {
     /// Returns true for `Yes`, false otherwise.
     pub fn is_yes(&self) -> bool {
-        match *self {
-            KeepAlive::Yes => true,
-            _ => false,
-        }
+        matches!(*self, KeepAlive::Yes)
     }
 }
 

swarm/src/registry.rs

@@ -285,7 +285,7 @@ impl<'a> Iterator for AddressIter<'a> {
         }
         let item = &self.items[self.offset];
         self.offset += 1;
-        Some(&item)
+        Some(item)
     }
 
     fn size_hint(&self) -> (usize, Option<usize>) {