[Modify] Polish it

websocket-sharp/Net/WebSockets/TcpListenerWebSocketContext.cs

@@ -452,8 +452,7 @@ namespace WebSocketSharp.Net.WebSockets
             return false;
           }
 
-          var user =
-            HttpUtility.CreateUser (
+          var user = HttpUtility.CreateUser (
                        _request.Headers["Authorization"],
                        scheme,
                        realm,
@@ -461,13 +460,13 @@ namespace WebSocketSharp.Net.WebSockets
                        credentialsFinder
                      );
 
-          if (user == null || !user.Identity.IsAuthenticated) {
-            SendAuthenticationChallenge (chal);
-            return auth ();
-          }
-
+          if (user != null && user.Identity.IsAuthenticated) {
             _user = user;
             return true;
+          }
+
+          SendAuthenticationChallenge (chal);
+          return auth ();
         };
 
       return auth ();