fix ethernet iface selection

Author: pennam

libraries/SocketWrapper/Ethernet.h

@@ -46,9 +46,9 @@ class EthernetClass: public NetworkInterface
     EthernetHardwareStatus hardwareStatus() {
         const struct device *const dev = DEVICE_DT_GET(DT_COMPAT_GET_ANY_STATUS_OKAY(ethernet_phy));
         if (device_is_ready(dev)) {
-            for (int i = 1; i < 3; i++) {
+            for (int i = 1; i <= 3; i++) {
                 auto _if = net_if_get_by_index(i);
-                if (!net_eth_type_is_wifi(_if)) {
+                if ((_if != nullptr) && !net_eth_type_is_wifi(_if)) {
                     netif = _if;
                     break;
                 }