staging: comedi: addi_apci_3xxx: remove unused define

This define is not used by the driver. Remove it.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/addi-data/hwdrv_apci3xxx.c

@@ -2,8 +2,6 @@
 #define APCI3XXX_DIFF				1
 #define APCI3XXX_CONFIGURATION			0
 
-#define APCI3XXX_TTL_INIT_DIRECTION_PORT2	0
-
 /*
 +----------------------------------------------------------------------------+
 |                         ANALOG INPUT FUNCTIONS                             |