init.d: openwrt hotplug script use link target of /etc/init.d/zapret

init.d/openwrt/90-zapret

@@ -3,7 +3,13 @@
 ZAPRET=/etc/init.d/zapret
 
 [ "$ACTION" = "ifup" ] && [ -x "$ZAPRET" ] && "$ZAPRET" enabled && {
-	[ -n "$ZAPRET_BASE" ] || ZAPRET_BASE=/opt/zapret
+	SCRIPT=$(readlink "$ZAPRET")
+	if [ -n "$SCRIPT" ]; then
+		EXEDIR=$(dirname "$SCRIPT")
+		ZAPRET_BASE=$(readlink -f "$EXEDIR/../..")
+	else
+		ZAPRET_BASE=/opt/zapret
+	fi
 	. "$ZAPRET_BASE/config"
 	[ -n "$OPENWRT_LAN" ] || OPENWRT_LAN=lan
 	for lan in $OPENWRT_LAN; do