Staging: comedi: serial2002: Fix memory leak on detach

The comedi device 'detach' method for the serial2002 driver has an
off-by-one error in its loop for freeing data belonging to its
subdevices.  Fix it.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/comedi/drivers/serial2002.c

@@ -903,7 +903,7 @@ static int serial2002_detach(struct comedi_device *dev)
 	int i;
 
 	printk("comedi%d: serial2002: remove\n", dev->minor);
-	for (i = 0; i < 4; i++) {
+	for (i = 0; i < 5; i++) {
 		s = &dev->subdevices[i];
 		if (s->maxdata_list) {
 			kfree(s->maxdata_list);