router_readconfig: properly restore cl and r
router_readconfig: properly restore cl and r

if we get a router struct to append to, restore the walking pointers

piotr1212/carbon-c-relay,grobian/carbon-c-relay,piotr1212/carbon-c-relay,grobian/carbon-c-relay,grobian/carbon-c-relay,piotr1212/carbon-c-relay,piotr1212/carbon-c-relay