some refactor

src/main.rs

@@ -103,18 +103,17 @@ async fn start_ban_server(
     info!("listening changes over {}", ssh_auth_log.display());
     loop {
         let next_line = lines.next_line().await;
-
         if let Err(err) = next_line {
             error!("reading next file: {}", err);
             continue;
         }
-        let line = next_line.unwrap();
+
+        let line = next_line?;
         if line.is_none() {
             continue;
         }
 
         let line = line.unwrap();
-
         if let Some(login_attempt) = LoginAttempt::capture(line.line()) {
             info!(
                 "login attempt from {}@{}:{}",
@@ -141,7 +140,7 @@ async fn start_ban_server(
                     }
                 }
                 None => {
-                    login_attempts.insert(login_attempt.ip.clone(), 1);
+                    login_attempts.insert(login_attempt.ip, 1);
                 }
             }
         }