policy-{node,endpoint-device}: do not hold reference to si_link in closure

This may keep the link alive for longer than expected

src/scripts/policy-endpoint-device.lua

@@ -97,7 +97,7 @@ function createLink (si_ep, si_target)
   si_link:activate (Feature.SessionItem.ACTIVE, function (l, e)
     if e then
       Log.warning (l, "failed to activate si-standard-link: " .. tostring(e))
-      si_link:remove ()
+      l:remove ()
     else
       Log.info (l, "activated si-standard-link")
     end

src/scripts/policy-node.lua

@@ -66,7 +66,7 @@ function createLink (si, si_target, passthrough, exclusive)
   si_link:activate (Feature.SessionItem.ACTIVE, function (l, e)
     if e then
       Log.warning (l, "failed to activate si-standard-link: " .. tostring(e))
-      si_link:remove ()
+      l:remove ()
     else
       Log.info (l, "activated si-standard-link")
     end