cluster: refactor empty for in round_robin_handle.js

PR-URL: #26560 Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: Michaël Zasso <targos@protonmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>

Author: gengjiawen

lib/internal/cluster/round_robin_handle.js

@@ -73,8 +73,10 @@ RoundRobinHandle.prototype.remove = function(worker) {
  if (this.all.size !== 0)
  return false;
 
- for (var handle; handle = this.handles.shift(); handle.close())
- ;
+ for (const handle of this.handles) {
+ handle.close();
+ }
+ this.handles = [];
 
  this.handle.close();
  this.handle = null;