staging: comedi: adv_pci1710: remove 'ai_act_chan' from private data

This member of the private data is not ued by the driver. Remove it.
Signed-off-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: NIan Abbott <abbotti@mev.co.uk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/adv_pci1710.c

@@ -299,7 +299,6 @@ static const struct boardtype boardtypes[] = {
 struct pci1710_private {
 	unsigned int CntrlReg;	/*  Control register */
 	unsigned int ai_act_scan;	/*  how many scans we finished */
-	unsigned int ai_act_chan;	/*  actual position in actual scan */
 	unsigned char ai_et;
 	unsigned int ai_et_CntrlReg;
 	unsigned int ai_et_MuxVal;