Staging: comedi: unlock on error in usbduxsigma_attach()

We should release the udev->sem lock before returning.

Signed-off-by: Dan Carpenter <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/comedi/drivers/usbduxsigma.c

···
 	if (ret < 0) {
 		dev_err(&udev->interface->dev,
 			"comedi%d: no space for subdev\n", dev->minor);
+		up(&udev->sem);
 		up(&start_stop_sem);
 		return ret;
 	}