fix some warnings

src/cache.rs

@@ -180,7 +180,7 @@ impl PostListCache {
         let list_ref = post_list_cache()
             .try_get_with(self.key.clone(), async {
                 let mut items: Vec<(i64, i32)> =
-                    query_posts.await?.iter().map(|p| self.p2pair(&p)).collect();
+                    query_posts.await?.iter().map(|p| self.p2pair(p)).collect();
                 items.sort_by(|a, b| a.0.cmp(&b.0));
                 Ok(Arc::new(RwLock::new(items)))
             })