Address PR comments

Author: utpilla

stress/src/throughput.rs

@@ -70,7 +70,6 @@ where
 
     let handle_main_thread = thread::spawn(move || {
         let mut last_collect_time = Instant::now();
-        let mut current_time: Instant;
         let mut total_count_old: u64 = 0;
 
         #[cfg(feature = "stats")]
@@ -79,7 +78,7 @@ where
         let mut system = System::new_all();
 
         loop {
-            current_time = Instant::now();
+            let current_time = Instant::now();
             let elapsed = current_time.duration_since(last_collect_time).as_secs();
             if elapsed >= SLIDING_WINDOW_SIZE {
                 let total_count_u64: u64 = worker_stats_shared_monitor