Propagate down USB explore error codes, so that failures to enumerate USB HUBs
behind USB HUBs are detected and the USB reset counter logic will kick in
preventing enumeration of continuously failing ports.

Submitted by: phk@
Tested by: bz@
PR: 237666
Sponsored by: Mellanox Technologies // NVIDIA Networking

(cherry picked from commit e5ff940a81b56cb236795e0059c44981053f8404)