Minor fix in generate_kdu_instance_name

Change-Id: I9d545eef82cb76cdd8a2effd22121904f40e4262
Signed-off-by: David Garcia <david.garcia@canonical.com>
diff --git a/n2vc/k8s_helm_base_conn.py b/n2vc/k8s_helm_base_conn.py
index 0298831..a79f038 100644
--- a/n2vc/k8s_helm_base_conn.py
+++ b/n2vc/k8s_helm_base_conn.py
@@ -1360,7 +1360,7 @@
 
     @staticmethod
     def generate_kdu_instance_name(**kwargs):
-        chart_name = kwargs["chart_name"]
+        chart_name = kwargs["kdu_model"]
         # check embeded chart (file or dir)
         if chart_name.startswith("/"):
             # extract file or directory name