staging: comedi: ii_pci20kc: remove CHAN macro

This macro is not used, and it looks to much like the comedi CR_CHAN
macro. Just remove it.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/ii_pci20kc.c

@@ -186,8 +186,6 @@ struct pci20xxx_private {
 	void __iomem *ioaddr;
 };
 
-#define CHAN (CR_CHAN(it->chanlist[0]))
-
 /* pci20006m */
 
 static int pci20006_insn_read(struct comedi_device *dev,