8.0 USB "device problem, disabling port"

[Mouse <mouse%Rodents-Montreal.ORG@localhost>]

In 8.0, and at least one earlier version, when the kernel doesn't like
a USB device for some reason the message generated just says "device
problem, disabling port" (with the hub name and port number).

Would I be out of place to suggest that this is a little...light on
useful information?  It's admittedly not on a par with the infamous
Nifty Doorways Eleventy upgrade message, but it's definitely further in
that direction than I'd like.  (As I used to tell the first-level
people back when I was doing second-level support, "it doesn't work" is
not a usable problem report.)

In the tree I'm using at work, I've just thrown printfs into
usbd_new_device.  But that's a bit ugly, probably not the best approach
(though I can certainly send a diff for what I have if anyone wants).
Thoughts?

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