Remove the devdb stuff, the kernel answers these questions just fine.

etc/rc.d/Makefile

@@ -5,7 +5,7 @@
 
 FILES=	DAEMON LOGIN NETWORKING SERVERS abi accounting addswap adjkerntz amd \
 	apm apmd archdep atm1 atm2.sh atm3.sh bgfsck bootparams ccd cleanvar \
-	cleartmp cron devd devdb devfs dhclient diskless dmesg dumpon fsck \
+	cleartmp cron devd devfs dhclient diskless dmesg dumpon fsck \
 	hostname inetd initdiskless initrandom ip6fw ipfilter ipfs ipfw ipmon \
 	ipnat ipsec ipxrouted isdnd jail \
 	kadmind kerberos keyserv kldxref kpasswdd \

etc/rc.d/devdb

@@ -1,17 +0,0 @@
-#!/bin/sh
-#
-# $FreeBSD$
-#
-
-# PROVIDE: devdb
-# REQUIRE: syslogd
-# KEYWORD: FreeBSD
-
-# Build device name databases if we are not using DEVFS
-#
-if sysctl vfs.devfs.generation > /dev/null 2>&1; then
-	rm -f /var/run/dev.db
-else
-	dev_mkdb
-fi
-