[Modify] Polish it

websocket-sharp/Server/WebSocketSessionManager.cs

@@ -149,11 +149,12 @@ namespace WebSocketSharp.Server
     /// </value>
     public IEnumerable<string> InactiveIDs {
       get {
-        foreach (var res in Broadping (WebSocketFrame.EmptyPingBytes, _waitTime))
+        foreach (var res in broadping (WebSocketFrame.EmptyPingBytes)) {
           if (!res.Value)
             yield return res.Key;
         }
       }
+    }
 
     /// <summary>
     /// Gets the session instance with <paramref name="id"/>.