Staging: comedi: usbduxfast: balance semaphores up/down in attach error path

Signed-off-by: Mariusz Kozlowski <m.kozlowski@tuxland.pl>
Cc: Bernd Porr <BerndPorr@f2s.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Cc: David Schleef <ds@schleef.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/comedi/drivers/usbduxfast.c

@@ -1766,6 +1766,7 @@ static int usbduxfast_attach(comedi_device *dev, comedi_devconfig *it)
 	if (ret < 0) {
 		printk(KERN_ERR "comedi%d: usbduxfast: error alloc space for "
 		       "subdev\n", dev->minor);
+		up(&(usbduxfastsub[index].sem));
 		up(&start_stop_sem);
 		return ret;
 	}