libusb issue when opening device

Dear all,

I just subscribed to this list since I encountered an issue after pulling the latest git commits.

lib: use interface 0 altsetting 1 instead of interface 1 ... This makes osmo-fl2k work again with Linux 5.5.0-rc6 or later,

On my system (Debian stable, kernel 4.19) this change results in "Error enabling IF 0 altsetting 1". Reverting to the previous version (with Interface 1) solved the problem for me.

I will investigate a bit more whether it is related to kernel or libusb versions. Or have I missed some other required configuration?

Best regards, Carl-Fredrik SM2YHP