…readable

if INSTR USB device,
- say that device is USB INSTR that failed in warning message
- catch exception
- debug message with traceback if logging level is DEBUG
- info message 1-line error summary if logging level is INFO
- if path f"/dev/bus/usb/{dev.bus:03d}/{dev.address:03d}" exists, check
  permissions on that file & refer to FAQ link (known issue on Linux)

if RAW USB device,
- say that device is USB RAW that failed in warning message