Newer gcc complain about missing mode argument when a new file is
created. This is an extract of man-pages:

 "The mode argument specifies the file mode bits be applied when
 a new file is created.  This argument must be supplied when
 O_CREAT or O_TMPFILE is specified in flags"

Signed-off-by: Franck Jullien <franck.jullien@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>