If pflogd is disabled, pflog0 doesn't get created, so this happens:

starting network daemons: dhcpd sendmail ftp-proxy identd inetd sshd
spamd spamlogdspamlogd: couldn't initialize pcap: Device not configured
..

I think this is better:

Index: rc
================================================== =================
RCS file: /cvs/src/etc/rc,v
retrieving revision 1.309
diff -u -p -r1.309 rc
--- etc/rc 9 Jan 2008 21:38:19 -0000 1.309
+++ etc/rc 16 Jan 2008 00:51:29 -0000
@@ -298,11 +298,13 @@ if [ -d /var/empty ]; then
fi
syslogd ${syslogd_flags}

-if [ X"${pf}" != X"NO" -a X"${pflogd_flags}" != X"NO" ]; then
+if [ X"${pf}" != X"NO" ]; then
ifconfig pflog0 create >/dev/null 2>&1
if ifconfig pflog0 >/dev/null 2>&1; then
ifconfig pflog0 up
- pflogd ${pflogd_flags}
+ if [ X"${pflogd_flags}" != X"NO" ]; then
+ pflogd ${pflogd_flags}
+ fi
fi
fi