Favor explicit refference cloning, as suggested by clippy.

hammond-cli/src/main.rs

@@ -51,7 +51,7 @@ fn run() -> Result<()> {
     if args.up {
         let db = hammond_data::establish_connection();
         let db = Arc::new(Mutex::new(db));
-        index_feed::index_loop(db.clone(), false)?;
+        index_feed::index_loop(&db.clone(), false)?;
     }
 
     if args.dl >= 0 {