staging: comedi: usbdux: remove unnecessary tidy_up() calls

If the comedi_driver (*auto_attach) fails, the comedi core will call
the (*detach) function to do any cleanup. It's not necessary to do
the cleanup in the (*auto_attach).
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/usbdux.c

@@ -2294,17 +2294,14 @@ static int usbdux_auto_attach(struct comedi_device *dev,
 	}
 
 	ret = usbdux_alloc_usb_buffers(devpriv);
-	if (ret) {
-		tidy_up(devpriv);
+	if (ret)
 		return ret;
-	}
 
 	/* setting to alternate setting 3: enabling iso ep and bulk ep. */
 	ret = usb_set_interface(devpriv->usbdev, devpriv->ifnum, 3);
 	if (ret < 0) {
 		dev_err(dev->class_dev,
 			"could not set alternate setting 3 in high speed\n");
-		tidy_up(devpriv);
 		return ret;
 	}