char/mxser: replace

@@ -59,6 +59,7 @@
 #include <linux/smp_lock.h>
 #include <linux/pci.h>
 #include <linux/init.h>
+#include <linux/delay.h>
 
 #include <asm/system.h>
 #include <asm/io.h>

@@ -820,8 +821,7 @@ static void mxser_close(struct tty_struc
 	info->tty = NULL;
 	if (info->blocked_open) {
 		if (info->close_delay) {
-			set_current_state(TASK_INTERRUPTIBLE);
-			schedule_timeout(info->close_delay);
+			msleep_interruptible(jiffies_to_msecs(info->close_delay));
 		}
 		wake_up_interruptible(&info->open_wait);
 	}