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

This member of the private data is set to 0 but never used. Just 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/adv_pci1710.c

@@ -302,7 +302,6 @@ struct pci1710_private {
 	unsigned int i8254_osc_base;	/*  frequence of onboard oscilator */
 	unsigned int ai_act_scan;	/*  how many scans we finished */
 	unsigned int ai_act_chan;	/*  actual position in actual scan */
-	unsigned int ai_buf_ptr;	/*  data buffer ptr in samples */
 	unsigned char ai_eos;	/*  1=EOS wake up */
 	unsigned char ai_et;
 	unsigned int ai_et_CntrlReg;
@@ -730,7 +729,6 @@ static int pci171x_ai_cancel(struct comedi_device *dev,
 
 	devpriv->ai_act_scan = 0;
 	s->async->cur_chan = 0;
-	devpriv->ai_buf_ptr = 0;
 
 	return 0;
 }
@@ -973,7 +971,6 @@ static int pci171x_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
 
 	devpriv->ai_act_scan = 0;
 	s->async->cur_chan = 0;
-	devpriv->ai_buf_ptr = 0;
 
 	devpriv->CntrlReg &= Control_CNT0;
 	/*  don't we want wake up every scan?  devpriv->ai_eos=1; */