Correct "interface" property on Linux hosts

The "interface" property should be read from the "usb_interface_path"
instead of the "device_path" as the later one is a directory (e.g.
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.3/1-2.3:1.0/ttyUSB1).
1 file changed