ninfod: Too many arguments for syslog(3)/fprintf(3) via DEBUG().

| ninfod.c: In function 'do_daemonize':
| ninfod.c:419:6: warning: too many arguments for format [-Wformat-extra-args]

Patch based on iputils-20121125-ninfod-minor.patch from Fedora.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>