staging: comedi: pcmuio: remove 'CALC_N_SUBDEVS' macro

This macro is only used once in the driver, just remove it.

This also fixes a > 80 char line checkpatch.pl warning.

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>