staging: comedi: pcmad: properly handle single/diff input configuration
The comedi_config utility is used to attach to this board. One of the
configuration options passed by the user sets the analog input reference
for single-ended or differential inputs.
Use the configuration option to correctly set the comedi_subdevice flags
as well as the number of channels.
Remove the 'differential' variable from the private data. Its not used
by the driver.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>