Staging: comedi: rtd520: &&/|| typo

Only error out on unexpected fifo size.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: Dan Christian <dac@ptolemy.arc.nasa.gov>
Cc: David Schleef <ds@schleef.org>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/comedi/drivers/rtd520.c

@@ -1234,7 +1234,7 @@ static int rtd520_probe_fifo_depth(comedi_device *dev)
 		return -EIO;
 	}
 	RtdAdcClearFifo(dev);
-	if(fifo_size != 0x400 || fifo_size != 0x2000)
+	if(fifo_size != 0x400 && fifo_size != 0x2000)
 	{
 		rt_printk("\ncomedi: %s: unexpected fifo size of %i, expected 1024 or 8192.\n",
 			DRV_NAME, fifo_size);