pg2-util: don't try to libusb_ref_device a null pointer if hotplug fails - #3
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If hotplug detection of the new usb device after a firmware load fails, and the caller wants to know the new device, don't crash trying to call libusb_ref_device with a null pointer
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If hotplug detection of the new usb device after a firmware load fails, and the caller wants to know the new device, don't crash trying to call libusb_ref_device with a null pointer