Staging: comedi: make comedi_set_subdevice_runflags() static

No one calls this anymore, except the core comedi code, so
mark it static and don't export it.

Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --cc drivers/staging/comedi/comedi_fops.c
Simple merge

diff --cc drivers/staging/comedi/comedidev.h
Simple merge