Chore: use int.max to indicate speed test fail

ClashX/General/ApiRequest.swift

@@ -168,7 +168,7 @@ class ApiRequest{
             , method: .get
             , parameters: ["timeout":5000,"url":"http://www.gstatic.com/generate_204"])
             .responseJSON { (res) in let json = JSON(res.result.value ?? [])
-                callback(json["delay"].int ?? -1)
+                callback(json["delay"].int ?? Int.max)
         }
     }
 }

ClashX/General/ProxyMenuItemFactory.swift

@@ -55,7 +55,7 @@ class ProxyMenuItemFactory {
             var speedText = ""
             let placeHolder = "\t"
             if let speedInfo = SpeedDataRecorder.shared.speedDict[proxy.stringValue] {
-                speedText = speedInfo > 0 ?"\(placeHolder)\(speedInfo) ms" : "\(placeHolder)fail"
+                speedText = speedInfo < Int.max ?"\(placeHolder)\(speedInfo) ms" : "\(placeHolder)fail"
             }
             
             let proxyItem = ProxyMenuItem(title: proxy.stringValue + speedText, action: #selector(ProxyMenuItemFactory.actionSelectProxy(sender:)), keyEquivalent: "")

ClashX/ViewControllers/SpeedTestViewController.swift

@@ -99,7 +99,7 @@ extension SpeedTestViewController:NSTableViewDataSource {
 
         if (model.delay == -2) {
             textField.stringValue = "testing"
-        } else if (model.delay == -1) {
+        } else if (model.delay == Int.max) {
             textField.stringValue = "fail"
         } else {
             textField.stringValue = "\(model.delay)"