Be a little more correct by setting CMDF_WRITE flag, in preparation for subdevices that support both input and output commands.
Be a little more correct by setting CMDF_WRITE flag, in preparation
for subdevices that support both input and output commands.

olsonse/comedilib,olsonse/comedilib,Linux-Comedi/comedilib,Linux-Comedi/comedilib,Linux-Comedi/comedilib,Linux-Comedi/comedilib,olsonse/comedilib,olsonse/comedilib,olsonse/comedilib,Linux-Comedi/comedilib,Linux-Comedi/comedilib,olsonse/comedilib