tc/zs: replace

@@ -1410,8 +1410,7 @@ static void rs_close(struct tty_struct *
 	info->tty = 0;
 	if (info->blocked_open) {
 		if (info->close_delay) {
-			current->state = TASK_INTERRUPTIBLE;
-			schedule_timeout(info->close_delay);
+			msleep_interruptible(jiffies_to_msecs(info->close_delay));
 		}
 		wake_up_interruptible(&info->open_wait);
 	}

@@ -1444,8 +1443,7 @@ static void rs_wait_until_sent(struct tt
 	if (timeout)
 		char_time = min_t(unsigned long, char_time, timeout);
 	while ((read_zsreg(info->zs_channel, 1) & Tx_BUF_EMP) == 0) {
-		current->state = TASK_INTERRUPTIBLE;
-		schedule_timeout(char_time);
+		msleep_interruptible(jiffies_to_msecs(char_time));
 		if (signal_pending(current))
 			break;
 		if (timeout && time_after(jiffies, orig_jiffies + timeout))