staging: comedi: addi-data: remove 'b_ValidDriver' from the private data

This variable is only used in the detach of the addi-data boards to
indicate that the attach of the board was successful and that the reset
function can be called. We can use the dev->iobase variable to indicate
this instead. Once this variable is set the attach always completes.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/addi-data/addi_common.c

@@ -367,7 +367,6 @@ static int addi_attach_pci(struct comedi_device *dev,
 	}
 
 	i_ADDI_Reset(dev);
-	devpriv->b_ValidDriver = 1;
 	return 0;
 }
 
@@ -378,7 +377,7 @@ static void i_ADDI_Detach(struct comedi_device *dev)
 	struct addi_private *devpriv = dev->private;
 
 	if (devpriv) {
-		if (devpriv->b_ValidDriver)
+		if (dev->iobase)
 			i_ADDI_Reset(dev);
 		if (dev->irq)
 			free_irq(dev->irq, dev);

drivers/staging/comedi/drivers/addi-data/addi_common.h

@@ -312,7 +312,6 @@ struct addi_private {
 	int i_IobaseAddon;	/* addon base address */
 	int i_IobaseReserved;
 	void __iomem *dw_AiBase;
-	unsigned char b_ValidDriver;	/*  driver is ok */
 	unsigned char b_AiContinuous;	/*  we do unlimited AI */
 	unsigned char b_AiInitialisation;
 	unsigned int ui_AiActualScan;	/* how many scans we finished */