staging: comedi: rtd520: remove RtdDma0Status macro

This macro uses the 'devpriv' macro which relies on a local variable
having a specific name. It's also not used. Remove the macro.
Signed-off-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/rtd520.c

@@ -406,10 +406,6 @@ struct rtdPrivate {
 
 /* Macros to access registers */
 
-/* Get status for DMA 0 */
-#define RtdDma0Status(dev) \
-	readb(devpriv->lcfg+LCFG_DMACSR0)
-
 /* Set control for DMA 1 (write only, shadow?) */
 #define RtdDma1Control(dev, n) \
 	writeb(devpriv->dma1Control = (n), devpriv->lcfg+LCFG_DMACSR1)