mtp-probe must use libusb_wrap_sys_device #331
Description
Currently, libusb may discover devices for which udev has not yet finished. This causes race conditions, as device permissions are not yet set up correctly. See libusb/libusb#1625.
Right now, fixing this breaks mtp-probe, because it cannot find the device it is looking for. This can be fixed (possible with some slight refactoring). mtp-probe receives all the information through environment variables and could also get e.g. the path passed explicitly as a parameter. So one can open the device file and then use libusb_wrap_sys_device.
We might do a workaround in libusb to permit discovering the device that the udev rule is running for. However, that is not nice and libmtp should be fixed to do the right thing.