How to close device handle when it is no longer valid!

["=?gb18030?b?wtLO6A==?=" <738899569@xxxxxx>]

I come across with a error:LIBUSB_ERROR_NOT_FOUND,and I found that it's caused by reset device,according to the annotation,I may close the device to solve it,or to re-enumeration,and how can I do it.
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