text: Fix USB bus path; /proc/bus/usb is deprecated.
  
  --- a/pcap-usb-linux.c
  +++ b/pcap-usb-linux.c
  @@ -73,7 +73,7 @@
   #define USB_TEXT_DIR_OLD "/sys/kernel/debug/usbmon"
   #define USB_TEXT_DIR "/sys/kernel/debug/usb/usbmon"
   #define SYS_USB_BUS_DIR "/sys/bus/usb/devices"
  -#define PROC_USB_BUS_DIR "/proc/bus/usb"
  +#define PROC_USB_BUS_DIR "/dev/bus/usb"
   #define USB_LINE_LEN 4096
   
   #if __BYTE_ORDER == __LITTLE_ENDIAN
  