message: fix CONFIG_UART_PROTOCOL check
diff: @@ -56,7 +56,7 @@ end
  -- GPIO settings
  if tup.getconfig("STEP_DIR") == "y" then
  - if tup.getconfig("UART_PROTOCOL") != "none" then
  + if tup.getconfig("UART_PROTOCOL") == "none" then
  FLAGS += "-DUSE_GPIO_MODE_STEP_DIR"
  else
  error("Step/dir mode conflicts with UART. Set CONFIG_UART_PROTOCOL to none.")
  