[Modify] Polish it

websocket-sharp/WebSocketFrame.cs

@@ -103,13 +103,19 @@ namespace WebSocketSharp
     }
 
     internal WebSocketFrame (
-      Fin fin, Opcode opcode, PayloadData payloadData, bool compressed, bool mask)
+      Fin fin,
+      Opcode opcode,
+      PayloadData payloadData,
+      bool compressed,
+      bool mask
+    )
     {
       _fin = fin;
+      _opcode = opcode;
+
       _rsv1 = opcode.IsData () && compressed ? Rsv.On : Rsv.Off;
       _rsv2 = Rsv.Off;
       _rsv3 = Rsv.Off;
-      _opcode = opcode;
 
       var len = payloadData.Length;
       if (len < 126) {