staging: comedi: adq12b: remove 's->len_chanlist' init for analog inputs

This driver does not support async commands so the len_chanlist init is
unnecessary. Remove it and allow the core to default the value to '1'.
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/adq12b.c

@@ -235,9 +235,6 @@ static int adq12b_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 					: &range_adq12b_ai_bipolar;
 
 	s->maxdata = 0xfff;
-
-	s->len_chanlist = 4;	/* This is the maximum chanlist length that
-				   the board can handle */
 	s->insn_read = adq12b_ai_insn_read;
 
 	s = &dev->subdevices[1];