Remove the HW_WDOG option; it serves no purpose.

MFC after:	3 days

sys/cam/scsi/scsi_da.c

@@ -29,10 +29,6 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-#ifdef _KERNEL
-#include "opt_hw_wdog.h"
-#endif /* _KERNEL */
-
 #include <sys/param.h>
 
 #ifdef _KERNEL

sys/conf/options

@@ -85,7 +85,6 @@ GEOM_STRIPE	opt_geom.h
 GEOM_SUNLABEL	opt_geom.h
 GEOM_UZIP	opt_geom.h
 GEOM_VOL	opt_geom.h
-HW_WDOG
 KSTACK_MAX_PAGES
 KSTACK_PAGES
 KTRACE

sys/kern/kern_shutdown.c

@@ -38,7 +38,6 @@
 __FBSDID("$FreeBSD$");
 
 #include "opt_kdb.h"
-#include "opt_hw_wdog.h"
 #include "opt_mac.h"
 #include "opt_panic.h"
 #include "opt_show_busybufs.h"
@@ -104,17 +103,6 @@ SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
 
 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
 
-#ifdef	HW_WDOG
-/*
- * If there is a hardware watchdog, point this at the function needed to
- * hold it off.
- * It's needed when the kernel needs to do some lengthy operations.
- * e.g. in wd.c when dumping core.. It's most annoying to have
- * your precious core-dump only half written because the wdog kicked in.
- */
-watchdog_tickle_fn wdog_tickler = NULL;
-#endif	/* HW_WDOG */
-
 /*
  * Variable panicstr contains argument to first call to panic; used as flag
  * to indicate that the kernel has already called panic.

sys/modules/cam/Makefile

@@ -11,7 +11,6 @@ KMOD=	cam
 SRCS=	opt_cam.h
 SRCS+=	opt_scsi.h
 SRCS+=	opt_cd.h
-SRCS+=	opt_hw_wdog.h
 SRCS+=	opt_pt.h
 SRCS+=	opt_sa.h
 SRCS+=	opt_ses.h

sys/pc98/pc98/wd.c

@@ -54,8 +54,6 @@
 
 #if     NWDC > 0
 
-#include "opt_hw_wdog.h"
-
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/kernel.h>