sched,watchdog: Convert to sched_set_fifo()

Because SCHED_FIFO is a broken scheduler model (see previous patches)
take away the priority field, the kernel can't possibly make an
informed decision.

Effectively changes prio from 99 to 50.

Cc: wim@linux-watchdog.org
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>

drivers/watchdog/watchdog_dev.c

@@ -1144,14 +1144,13 @@ void watchdog_dev_unregister(struct watchdog_device *wdd)
 int __init watchdog_dev_init(void)
 {
 	int err;
-	struct sched_param param = {.sched_priority = MAX_RT_PRIO - 1,};
 
 	watchdog_kworker = kthread_create_worker(0, "watchdogd");
 	if (IS_ERR(watchdog_kworker)) {
 		pr_err("Failed to create watchdog kworker\n");
 		return PTR_ERR(watchdog_kworker);
 	}
-	sched_setscheduler(watchdog_kworker->task, SCHED_FIFO, &param);
+	sched_set_fifo(watchdog_kworker->task);
 
 	err = class_register(&watchdog_class);
 	if (err < 0) {