alarmtimer: Remove unnecessary (void *) cast

Pointers of type void * do not require a type cast when they are assigned
to a real pointer.
Signed-off-by: Li zeming <zeming@nfschina.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230609182059.4509-1-zeming@nfschina.com

kernel/time/alarmtimer.c

@@ -751,7 +751,7 @@ static int alarm_timer_create(struct k_itimer *new_timer)
 static enum alarmtimer_restart alarmtimer_nsleep_wakeup(struct alarm *alarm,
 								ktime_t now)
 {
-	struct task_struct *task = (struct task_struct *)alarm->data;
+	struct task_struct *task = alarm->data;
 
 	alarm->data = NULL;
 	if (task)