Update the last lookup time for a neighbor when actually doing a lookup. Also fixed some coding style issues.

core/net/uip-ds6.c

@@ -366,6 +366,7 @@ uip_ds6_nbr_lookup(uip_ipaddr_t *ipaddr)
      ((uip_ds6_element_t *)uip_ds6_nbr_cache, UIP_DS6_NBR_NB,
       sizeof(uip_ds6_nbr_t), ipaddr, 128,
       (uip_ds6_element_t **)&locnbr) == FOUND) {
+    locnbr->last_lookup = clock_time();
     return locnbr;
   }
   return NULL;