net: sched: tapr: remove WARN_ON() in taprio_get_start_time()

There is a reproducible sequence from the userland that will trigger a WARN_ON()
condition in taprio_get_start_time, which causes kernel to panic if configured
as "panic_on_warn". Remove this WARN_ON() to prevent kernel from crashing by
userland-initiated syscalls.

Reported as bug on syzkaller:
https://syzkaller.appspot.com/bug?extid=d50710fd0873a9c6b40c

Reported-by: syzbot+d50710fd0873a9c6b40c@syzkaller.appspotmail.com
Signed-off-by: Du Cheng <ducheng2@gmail.com>

net/sched/sch_taprio.c

@@ -996,7 +996,7 @@ static int taprio_get_start_time(struct Qdisc *sch,
 	 * something went really wrong. In that case, we should warn about this
 	 * inconsistent state and return error.
 	 */
-	if (WARN_ON(!cycle))
+	if (!cycle) {
 		return -EFAULT;
 
 	/* Schedule the start time for the beginning of the next