wdog_attach
wdog_match, wdog_attach, NULL, NULL);
extern void wdog_attach(device_t, device_t, void *);
wdog_match, wdog_attach, NULL, NULL);
static void wdog_attach(device_t, device_t, void *);
static void wdog_attach(device_t, device_t, void *);
wdog_match, wdog_attach, NULL, NULL);