check uci instead of pidfile.

ffs-set-segment/files/etc/init.d/ffs-set-segment

@@ -4,7 +4,7 @@ START=97
 
 start () {
     uci set fastd.mesh_vpn.on_connect='/usr/sbin/ffs-set-segment'
-    if [ -d "/proc/$(cat /var/run/fastd.mesh_vpn.pid)" ]; then
+    if [ "$(uci get fastd.mesh_vpn.enabled)" = "1" ]; then
         /etc/init.d/fastd restart
     fi