Fix return values for usb_find_busses() and usb_find_devices(). We should try to return the actual number of busses and devices.
Fix return values for usb_find_busses() and usb_find_devices(). We should try
to return the actual number of busses and devices.

Reported by:	Mike Tancsa
Submitted by:	Hans Petter Selaksy

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase