Corrected authenticator GTK setting

When using random GTK on authenticator init GTK hash and key
were not correctly updated to Wi-SUN boostrap.

Author: Mika Leppänen

source/6LoWPAN/ws/ws_pae_auth.c

@@ -257,17 +257,19 @@ void ws_pae_auth_start(protocol_interface_info_entry_t *interface_ptr)
         return;
     }
 
+    // Checks if there is predefined active key
     int8_t index = sec_prot_keys_gtk_status_active_get(pae_auth->gtks);
-    if (index >= 0) {
-        // If there is predefined active key inserts it
-        ws_pae_auth_network_keys_from_gtks_set(pae_auth);
-    } else {
-        // Gets a new key
+    if (index < 0) {
+        // If there is no key, inserts a new one
         ws_pae_auth_gtk_key_insert(pae_auth);
         index = sec_prot_keys_gtk_install_order_first_index_get(pae_auth->gtks);
         ws_pae_auth_active_gtk_set(pae_auth, index);
     }
 
+    // Inserts keys and updates GTK hash on stack
+    ws_pae_auth_network_keys_from_gtks_set(pae_auth);
+
+    // Sets active key index
     ws_pae_auth_network_key_index_set(pae_auth, index);
 }