ndp: timex -> uint32_t for probe delay time

sys/net/gnrc/network_layer/ndp/internal/gnrc_ndp_internal.c

@@ -92,7 +92,7 @@ ipv6_addr_t *gnrc_ndp_internal_default_router(void)
 void gnrc_ndp_internal_set_state(gnrc_ipv6_nc_t *nc_entry, uint8_t state)
 {
     gnrc_ipv6_netif_t *ipv6_iface;
-    timex_t t = { GNRC_NDP_FIRST_PROBE_DELAY, 0 };
+    uint32_t t = GNRC_NDP_FIRST_PROBE_DELAY * SEC_IN_USEC;
 
     nc_entry->flags &= ~GNRC_IPV6_NC_STATE_MASK;
     nc_entry->flags |= state;