treewide: Switch DEFINE_TIMER callbacks to struct timer_list *

This changes all DEFINE_TIMER() callbacks to use a struct timer_list
pointer instead of unsigned long. Since the data argument has already been
removed, none of these callbacks are using their argument currently, so
this renames the argument to "unused".

Done using the following semantic patch:

@match_define_timer@
declarer name DEFINE_TIMER;
identifier _timer, _callback;
@@

 DEFINE_TIMER(_timer, _callback);

@change_callback depends on match_define_timer@
identifier match_define_timer._callback;
type _origtype;
identifier _origarg;
@@

 void
-_callback(_origtype _origarg)
+_callback(struct timer_list *unused)
 { ... }

Signed-off-by: Kees Cook <keescook@chromium.org>

drivers/watchdog/sc520_wdt.c

@@ -123,7 +123,7 @@ MODULE_PARM_DESC(nowayout,
 
 static __u16 __iomem *wdtmrctl;
 
-static void wdt_timer_ping(unsigned long);
+static void wdt_timer_ping(struct timer_list *);
 static DEFINE_TIMER(timer, wdt_timer_ping);
 static unsigned long next_heartbeat;
 static unsigned long wdt_is_open;
@@ -134,7 +134,7 @@ static DEFINE_SPINLOCK(wdt_spinlock);
  *	Whack the dog
  */
 
-static void wdt_timer_ping(unsigned long data)
+static void wdt_timer_ping(struct timer_list *unused)
 {
 	/* If we got a heartbeat pulse within the WDT_US_INTERVAL
 	 * we agree to ping the WDT