Fix clippy 1.72 and 1.73 lints (#289)

Classic PR of mine.

hostsfile/src/lib.rs

@@ -97,7 +97,7 @@ impl HostsBuilder {
     /// Adds a mapping of `ip` to `hostname`. If there hostnames associated with the IP already,
     /// the hostname will be appended to the list.
     pub fn add_hostname<S: ToString>(&mut self, ip: IpAddr, hostname: S) {
-        let hostnames_dest = self.hostname_map.entry(ip).or_insert_with(Vec::new);
+        let hostnames_dest = self.hostname_map.entry(ip).or_default();
         hostnames_dest.push(hostname.to_string());
     }
 
@@ -108,7 +108,7 @@ impl HostsBuilder {
         ip: IpAddr,
         hostnames: I,
     ) {
-        let hostnames_dest = self.hostname_map.entry(ip).or_insert_with(Vec::new);
+        let hostnames_dest = self.hostname_map.entry(ip).or_default();
         for hostname in hostnames.into_iter() {
             hostnames_dest.push(hostname.to_string());
         }

shared/src/types.rs

@@ -644,7 +644,7 @@ impl<'a> PeerDiff<'a> {
                 .replace_allowed_ips()
                 .add_allowed_ips(new_allowed_ips);
             changes.push(PeerChange::AllowedIPs {
-                old: old.map(|o| o.allowed_ips.clone()).unwrap_or_else(Vec::new),
+                old: old.map(|o| o.allowed_ips.clone()).unwrap_or_default(),
                 new: new_allowed_ips.to_vec(),
             });
         }
@@ -921,7 +921,7 @@ mod tests {
 
         println!("{peer:?}");
         println!("{:?}", info.config);
-        assert!(matches!(diff, Some(_)));
+        assert!(diff.is_some());
     }
 
     #[test]

wireguard-control/src/backends/kernel.rs

@@ -366,8 +366,7 @@ pub fn get_by_name(name: &InterfaceName) -> Result<Device, io::Error> {
         responses.len()
     );
 
-    let nlas = responses.into_iter().fold(Ok(vec![]), |nlas_res, nlmsg| {
+    let nlas = responses.into_iter().try_fold(vec![], |mut nlas, nlmsg| {
-        let mut nlas = nlas_res?;
         let mut message = match nlmsg {
             NetlinkMessage {
                 payload: NetlinkPayload::InnerMessage(message),