USB 2.5.0 -> 2.6.14.3 upgrade: Store actual bus number by querying upper-laying driver.
drwxr-xr-x - cis
drwxr-xr-x - irc
drwxr-xr-x - msvc6
drwxr-xr-x - os2
drwxr-xr-x - posix
drwxr-xr-x - reactos
drwxr-xr-x - rosapps
drwxr-xr-x - rosky
drwxr-xr-x - vms