Adds const keyword

Signed-off-by: Martin Melik Merkumians <melik-merkumians@acin.tuwien.ac.at>

source/src/cip/appcontype.c

@@ -436,7 +436,7 @@ bool ConnectionWithSameConfigPointExists(const EipUint32 config_point) {
   const DoublyLinkedListNode *node = connection_list.first;
 
   while (NULL != node) {
-    CipConnectionObject *connection = node->data;
+    const CipConnectionObject *const connection = node->data;
     OPENER_ASSERT(NULL != connection);
     if (config_point == connection->configuration_path.instance_id) {
       return true;