There is no need to calculate the subdevice for the call to
das800_cancel. The variable 's' in this function is set to the
'dev->read_subdev' which is the same as 'dev->subdevices + 0'.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>