[Modify] Polish it

websocket-sharp/Net/ResponseStream.cs

@@ -179,16 +179,16 @@ namespace WebSocketSharp.Net
         }
       }
 
-      if (closing) {
+      if (!closing) {
+        _body = new MemoryStream ();
+        return;
+      }
+
       if (_sendChunked)
         _write (_lastChunk, 0, 5);
 
       _body = null;
     }
-      else {
-        _body = new MemoryStream ();
-      }
-    }
 
     private bool flushHeaders (bool closing)
     {