chenhaifeng2016 issues

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                                            chenhaifeng2016

why the second request always return -1

env: windows 10 x64 visual studio 2019 libmodbus 3.1.6 code ![code](https://user-images.githubusercontent.com/18096245/68004654-480f1300-fcad-11e9-90ee-8eb1d3b7f319.png) result ![result](https://user-images.githubusercontent.com/18096245/68004652-45acb900-fcad-11e9-82f6-86c8adf4a2af.png) why?