Remove redundancy

accounts-db/src/accounts_db.rs

@@ -5088,27 +5088,24 @@ impl AccountsDb {
             }
         });
 
-        let mut ancient_slots_added = 0;
         // If there are too few slots to shrink, add an ancient slot
         // for shrinking.
         if shrink_slots.len() < SHRINK_INSERT_ANCIENT_THRESHOLD {
-            let mut ancients = self.best_ancient_slots_to_shrink.write().unwrap();
-            if let Some((slot, capacity)) = ancients.first_mut() {
+            let ancients = self.best_ancient_slots_to_shrink.read().unwrap();
+            if let Some((slot, capacity)) = ancients.first() {
                 if let Some(store) = self.storage.get_slot_storage_entry(*slot) {
                     if !shrink_slots.contains(slot)
                         && *capacity == store.capacity()
                         && Self::is_candidate_for_shrink(self, &store)
                     {
-                        *capacity = 0;
-                        ancient_slots_added += 1;
                         let ancient_bytes_added_to_shrink = store.alive_bytes() as u64;
                         shrink_slots.insert(*slot, store);
                         self.shrink_stats
                             .ancient_bytes_added_to_shrink
                             .fetch_add(ancient_bytes_added_to_shrink, Ordering::Relaxed);
                         self.shrink_stats
                             .ancient_slots_added_to_shrink
-                            .fetch_add(ancient_slots_added, Ordering::Relaxed);
+                            .fetch_add(1, Ordering::Relaxed);
                     }
                 }
             }