softlockup: s/99/MAX_RT_PRIO/

Don't use hardcoded 99 value, use MAX_RT_PRIO.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/softlockup.c

@@ -82,7 +82,7 @@ void softlockup_tick(void)
  */
 static int watchdog(void * __bind_cpu)
 {
-	struct sched_param param = { .sched_priority = 99 };
+	struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
 
 	sched_setscheduler(current, SCHED_FIFO, &param);
 	current->flags |= PF_NOFREEZE;