staging: comedi: adv_pci1710: rename check_channel_list()

For aesthetics, rename this function so it has namespace associated
with the driver.

Also, change it's parameters. The cmd->chanlist and cmd->chanlist_len
are always passed, just pass the comedi_cmd pointer instead.

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>