Fix clippy nightly nits

examples/src/bin/tlsclient-mio.rs

@@ -471,7 +471,7 @@ fn make_config(args: &Args) -> Arc<rustls::ClientConfig> {
     if args.flag_cafile.is_some() {
         let cafile = args.flag_cafile.as_ref().unwrap();
 
-        let certfile = fs::File::open(&cafile).expect("Cannot open CA file");
+        let certfile = fs::File::open(cafile).expect("Cannot open CA file");
         let mut reader = BufReader::new(certfile);
         root_store.add_parsable_certificates(&rustls_pemfile::certs(&mut reader).unwrap());
     } else {

examples/src/bin/tlsserver-mio.rs

@@ -541,7 +541,7 @@ fn load_private_key(filename: &str) -> rustls::PrivateKey {
 fn load_ocsp(filename: &Option<String>) -> Vec<u8> {
     let mut ret = Vec::new();
 
-    if let &Some(ref name) = filename {
+    if let Some(name) = filename {
         fs::File::open(name)
             .expect("cannot open ocsp file")
             .read_to_end(&mut ret)

rustls/src/verify.rs

@@ -619,7 +619,7 @@ pub struct NoClientAuth;
 impl NoClientAuth {
     /// Constructs a `NoClientAuth` and wraps it in an `Arc`.
     pub fn new() -> Arc<dyn ClientCertVerifier> {
-        Arc::new(NoClientAuth)
+        Arc::new(Self)
     }
 }