staging: comedi: dt9812: remove unused variables from private data

The vendor, product, and serial numbers read from the usb device
are only used for a dev_info() message about the device after it
is reset. Reading these values might not be required for the usb
device to function.

For now just remove the variables from the private data and just
use local variables.
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/dt9812.c

@@ -263,9 +263,6 @@ struct dt9812_private {
 		__u8 addr;
 		size_t size;
 	} cmd_wr, cmd_rd;
-	u32 serial;
-	u16 vendor;
-	u16 product;
 	u16 device;
 	u16 ao_shadow[2];
 	u8 do_shadow;
@@ -741,11 +738,13 @@ static int dt9812_reset_device(struct comedi_device *dev)
 	struct usb_interface *intf = comedi_to_usb_interface(dev);
 	struct usb_device *usb = interface_to_usbdev(intf);
 	struct dt9812_private *devpriv = dev->private;
-	int ret;
-	int i;
-	u32 tmp32;
+	u32 serial;
+	u16 vendor;
+	u16 product;
 	u16 tmp16;
 	u8 tmp8;
+	int ret;
+	int i;
 
 	ret = dt9812_read_info(dev, 0, &tmp8, sizeof(tmp8));
 	if (ret) {
@@ -765,19 +764,19 @@ static int dt9812_reset_device(struct comedi_device *dev)
 		}
 	}
 
-	ret = dt9812_read_info(dev, 1, &tmp16, sizeof(tmp16));
+	ret = dt9812_read_info(dev, 1, &vendor, sizeof(vendor));
 	if (ret) {
 		dev_err(&intf->dev, "failed to read vendor id\n");
 		return ret;
 	}
-	devpriv->vendor = le16_to_cpu(tmp16);
+	vendor = le16_to_cpu(vendor);
 
-	ret = dt9812_read_info(dev, 3, &tmp16, sizeof(tmp16));
+	ret = dt9812_read_info(dev, 3, &product, sizeof(product));
 	if (ret) {
 		dev_err(&intf->dev, "failed to read product id\n");
 		return ret;
 	}
-	devpriv->product = le16_to_cpu(tmp16);
+	product = le16_to_cpu(product);
 
 	ret = dt9812_read_info(dev, 5, &tmp16, sizeof(tmp16));
 	if (ret) {
@@ -786,17 +785,16 @@ static int dt9812_reset_device(struct comedi_device *dev)
 	}
 	devpriv->device = le16_to_cpu(tmp16);
 
-	ret = dt9812_read_info(dev, 7, &tmp32, sizeof(tmp32));
+	ret = dt9812_read_info(dev, 7, &serial, sizeof(serial));
 	if (ret) {
 		dev_err(&intf->dev, "failed to read serial number\n");
 		return ret;
 	}
-	devpriv->serial = le32_to_cpu(tmp32);
+	serial = le32_to_cpu(serial);
 
 	/* let the user know what node this device is now attached to */
 	dev_info(&intf->dev, "USB DT9812 (%4.4x.%4.4x.%4.4x) #0x%8.8x\n",
-		 devpriv->vendor, devpriv->product, devpriv->device,
-		 devpriv->serial);
+		 vendor, product, devpriv->device, serial);
 
 	return 0;
 }