Hi Didier,
No you didn't. I just had this mail in my outbox (but not sent) for a week; it just went out now as I logged back on my laptop. It's just some time-warping :-)
I have a similar problem on OBS, and as a dirty workaround I simply unpack on a build machine an archive that contains go cache of all downloaded dependencies. Not very convenient, but it works.
If problem still exist, after a week of labtop being not used :-), I can put release tag on goipp. As go dependencies are versioned, I will have to update and re-release the ipp-usb too.
Note, the goipp library is not expected to be updated very often. -- Wishes, Alexander Pevzner (pzz@apevzner.com)