discard used bytes without the offset

platform/qt/dmxwidget/dmxwidget.cpp

@@ -109,7 +109,8 @@ void DmxWidget::parseMessageBuffer()
     msg->iStream(stream);
     // ship it
     routeRxMessage(msg);
-    fast_forward(length + fixed_length - 1); // discard processed bytes
+    // discard processed bytes
+    fast_forward(length + fixed_length);
   }
 }