staging: comedi: jr3_pci: Reset all DSPs

The various JR3 PCI models have from 1 to 4 DSPs, one per subdevice.
Prior to loading the firmware to all the DSPs, the initialization code
in `jr3_pci_auto_attach()` resets the first DSP.  As far as I can tell,
it should reset all of them.  Change it to do so.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/jr3_pci.c

@@ -736,7 +736,8 @@ static int jr3_pci_auto_attach(struct comedi_device *dev,
 	}
 
 	/* Reset DSP card */
-	writel(0, &devpriv->iobase->channel[0].reset);
+	for (i = 0; i < dev->n_subdevices; i++)
+		writel(0, &devpriv->iobase->channel[i].reset);
 
 	ret = comedi_load_firmware(dev, &comedi_to_pci_dev(dev)->dev,
 				   "comedi/jr3pci.idm",