WiFi: allow status() to be called before begin()

Author: pennam

libraries/SocketWrapper/WiFi.h

@@ -79,11 +79,13 @@ class WiFiClass : public NetworkInterface {
 		return true;
 	}
 
-	int status() {
-		if (net_mgmt(NET_REQUEST_WIFI_IFACE_STATUS, netif, &sta_state,
-					 sizeof(struct wifi_iface_status))) {
-			return WL_NO_SHIELD;
-		}
+    int status() {
+        sta_iface = net_if_get_wifi_sta();
+        netif = sta_iface;
+        if (net_mgmt(NET_REQUEST_WIFI_IFACE_STATUS, netif, &sta_state,
+                sizeof(struct wifi_iface_status))) {
+            return WL_NO_SHIELD;
+        }
 
 		if (sta_state.state >= WIFI_STATE_ASSOCIATED) {
 			return WL_CONNECTED;