Staging: comedi: cb_pcidas.c: Fix build warning (type mismatch)

spin_lock_irqsave expects flags to be unsigned long, not unsigned int.
Signed-off-by: Gerard Lledo <gerard.lledo@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/comedi/drivers/cb_pcidas.c

@@ -1593,7 +1593,7 @@ static void handle_ao_interrupt(struct comedi_device *dev, unsigned int status)
 	struct comedi_cmd *cmd = &async->cmd;
 	unsigned int half_fifo = thisboard->fifo_size / 2;
 	unsigned int num_points;
-	unsigned int flags;
+	unsigned long flags;
 
 	async->events = 0;