staging: comedi: ni_daq_700: remove unused private data variable

The 'have_irq' variable is not needed since this driver doesn't
use interrupts. Remove it.

The kfree(s->private) needs to remain to free the memory allocated
in subdev_700_init().
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/ni_daq_700.c

@@ -69,7 +69,6 @@ struct dio700_board {
 struct subdev_700_struct {
 	unsigned long cb_arg;
 	int (*cb_func) (int, int, int, unsigned long);
-	int have_irq;
 };
 
 #define CALLBACK_ARG	(((struct subdev_700_struct *)s->private)->cb_arg)
@@ -166,8 +165,6 @@ static void subdev_700_cleanup(struct comedi_device *dev,
 			       struct comedi_subdevice *s)
 {
 	if (s->private)
-		if (subdevpriv->have_irq)
-
 		kfree(s->private);
 }