Revert the previous afexists() change. Knobs configured explicitly by

the user should not be ignored if possible even if the kernel does not
support the prerequisite feature.

Discussed with:	ume

etc/rc.d/faith

@@ -15,8 +15,6 @@ stop_cmd="faith_down"
 
 faith_up()
 {
-	afexists inet6 || return 0
-
 	case ${ipv6_faith_prefix} in
 	[Nn][Oo] | '')
 		;;
@@ -50,8 +48,6 @@ faith_up()
 
 faith_down()
 {
-	afexists inet6 || return 0
-
 	echo "Removing IPv6-to-IPv4 TCP relay capturing interface: faith0."
 	ifconfig faith0 destroy
 	${SYSCTL_W} net.inet6.ip6.keepfaith=0

etc/rc.d/static_arp

@@ -44,8 +44,6 @@ static_arp_start()
 {
 	local e arp_args
 
-	afexists inet || return 0
-
 	if [ -n "${static_arp_pairs}" ]; then
 		echo -n 'Binding static ARP pair(s):'
 		for e in ${static_arp_pairs}; do
@@ -61,8 +59,6 @@ static_arp_stop()
 {
 	local e arp_args
 
-	afexists inet || return 0
-
 	if [ -n "${static_arp_pairs}" ]; then
 		echo -n 'Unbinding static ARP pair(s):'
 		for e in ${static_arp_pairs}; do

etc/rc.d/stf

@@ -15,8 +15,6 @@ stop_cmd="stf_down"
 
 stf_up()
 {
-	afexists inet6 || return 0
-
 	case ${stf_interface_ipv4addr} in
 	[Nn][Oo] | '')
 		;;
@@ -69,8 +67,6 @@ stf_up()
 
 stf_down()
 {
-	afexists inet6 || return 0
-
 	echo "Removing 6to4 tunnel interface: stf0." 
 	ifconfig stf0 destroy
 	route delete -inet6 2002:e000:: -prefixlen 20 ::1