fix wrong BOS response length in Linux, fix #45 #49
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Linux 在 USB 枚举中请求 BOS 时会先发一个 wLength 为 5 的 get descriptor request BOS 包,来获取 BOS 的前 5 字节中的长度信息,然后在下一个 request 中获取 BOS 全文。
因此在发送 BOS response 时要考虑 request 的 wLength 进行截断。
若返回的数据长度比 wLength 大的话会导致 usbip 中的
usbip_recv_xbuff
出错,即日志中的