staging: comedi: comedidev.h: introduce some 'range_is_external' helpers
The comedi_krange includes a flags member that currently identifies the 'units' of the range (RF_UNIT) and if the range is from an internal or external source (RF_EXTERNAL). Introduce some helper functions to check if a given range is from an external source. 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>
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