Bug fixed

src/libusbdevice.cpp

@@ -39,6 +39,7 @@ bool LibUsbDevice::sendDataToDevice(const Data &data)
 {
     if (!m_device) {
         std::cerr << "Device not opened" << std::endl;
+        return false;
     }
 
     auto requestType = LIBUSB_ENDPOINT_OUT | LIBUSB_REQUEST_TYPE_CLASS | LIBUSB_RECIPIENT_INTERFACE;