staging: comedi: cb_das16_cs: return '0' for successful attach

The comedi core expects a < 0 value during the attach to indicate
an error. The normal 'success' return to the kernel is '0' so use
that here.
Signed-off-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/cb_das16_cs.c

@@ -513,7 +513,7 @@ static int das16cs_attach(struct comedi_device *dev,
 		dev->driver->driver_name, dev->board_name,
 		dev->iobase, dev->irq);
 
-	return 1;
+	return 0;
 }
 
 static void das16cs_detach(struct comedi_device *dev)