Staging: comedi: addi-data: Fix long CamelCase function names

This patch fixes a few function names that are very long and are
not in the correct naming style

Signed-off-by: Fred Akers <knivey@botops.net>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>