staging: comedi: cleanup comedi_alloc_subdevices

Access the individual comedi_subdevices using a pointer instead
of directly accessing as an array. This is how the rest of the
comedi core accesses them.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbott@mev.co.uk>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers.c

@@ -58,21 +58,24 @@ struct comedi_driver *comedi_drivers;
 
 int comedi_alloc_subdevices(struct comedi_device *dev, int num_subdevices)
 {
+	struct comedi_subdevice *s;
 	int i;
 
 	if (num_subdevices < 1)
 		return -EINVAL;
-	dev->subdevices =
-	    kcalloc(num_subdevices, sizeof(struct comedi_subdevice),
-		    GFP_KERNEL);
-	if (!dev->subdevices)
+
+	s = kcalloc(num_subdevices, sizeof(*s), GFP_KERNEL);
+	if (!s)
 		return -ENOMEM;
+	dev->subdevices = s;
 	dev->n_subdevices = num_subdevices;
+
 	for (i = 0; i < num_subdevices; ++i) {
-		dev->subdevices[i].device = dev;
-		dev->subdevices[i].async_dma_dir = DMA_NONE;
-		spin_lock_init(&dev->subdevices[i].spin_lock);
-		dev->subdevices[i].minor = -1;
+		s = dev->subdevices + i;
+		s->device = dev;
+		s->async_dma_dir = DMA_NONE;
+		spin_lock_init(&s->spin_lock);
+		s->minor = -1;
 	}
 	return 0;
 }