staging: comedi: ni_mio_common: remove unused variable in ni_ao_fifo_load()

The local variable 'range' is set but never used. 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/ni_mio_common.c

@@ -1131,14 +1131,11 @@ static void ni_ao_fifo_load(struct comedi_device *dev,
 	int i;
 	unsigned short d;
 	u32 packed_data;
-	int range;
 
 	chan = async->cur_chan;
 	for (i = 0; i < n; i++) {
 		comedi_buf_read_samples(s, &d, 1);
 
-		range = CR_RANGE(cmd->chanlist[chan]);
-
 		if (devpriv->is_6xxx) {
 			packed_data = d & 0xffff;
 			/* 6711 only has 16 bit wide ao fifo */