Fix Clippy warnings

clippy 0.1.54 (bf62f4de32a 2021-06-23)

src/common/thread_pool.rs

@@ -68,7 +68,7 @@ impl ThreadPoolRegistry {
     }
 
     pub(crate) fn release_pool(pool: &Arc<ThreadPool>) {
-        if Arc::strong_count(&pool) <= 2 {
+        if Arc::strong_count(pool) <= 2 {
             // No other client exists; only this Arc and the registry are
             // the owners. Let's remove and drop the one in the registry.
             let name = pool.name;

src/sync/base_cache.rs

@@ -64,7 +64,7 @@ impl<K, V, S> Clone for BaseCache<K, V, S> {
             inner: Arc::clone(&self.inner),
             read_op_ch: self.read_op_ch.clone(),
             write_op_ch: self.write_op_ch.clone(),
-            housekeeper: self.housekeeper.as_ref().map(|h| Arc::clone(&h)),
+            housekeeper: self.housekeeper.as_ref().map(|h| Arc::clone(h)),
         }
     }
 }
@@ -264,7 +264,7 @@ where
                 let cnt = op_cnt2.fetch_add(1, Ordering::Relaxed);
                 op2 = Some((
                     cnt,
-                    Arc::clone(&old_entry),
+                    Arc::clone(old_entry),
                     WriteOp::Upsert(KeyHash::new(Arc::clone(&key), hash), Arc::clone(&entry)),
                 ));
                 entry
@@ -756,7 +756,7 @@ where
             entry,
         );
         if self.is_write_order_queue_enabled() {
-            deqs.push_back_wo(KeyDate::new(key, raw_last_modified), &entry);
+            deqs.push_back_wo(KeyDate::new(key, raw_last_modified), entry);
         }
         entry.set_is_admitted(true);
     }

src/unsync/cache.rs

@@ -273,7 +273,7 @@ where
         let keys_to_invalidate = cache
             .iter()
             .filter(|(key, entry)| (predicate)(key, &entry.value))
-            .map(|(key, _)| Rc::clone(&key))
+            .map(|(key, _)| Rc::clone(key))
             .collect::<Vec<_>>();
 
         keys_to_invalidate.into_iter().for_each(|k| {
@@ -462,8 +462,8 @@ where
             entry.set_last_modified(ts);
         }
         let deqs = &mut self.deques;
-        deqs.move_to_back_ao(&entry);
-        deqs.move_to_back_wo(&entry)
+        deqs.move_to_back_ao(entry);
+        deqs.move_to_back_wo(entry)
     }
 
     fn evict(&mut self, now: Instant) {