VOL-1797 - fix helm lint issues

Change-Id: I74ccff1f7f431e05fc3963d0707382f478a010f0
diff --git a/voltha/templates/ofagent.yaml b/voltha/templates/ofagent.yaml
index 81f83ec..6ff7c03 100644
--- a/voltha/templates/ofagent.yaml
+++ b/voltha/templates/ofagent.yaml
@@ -37,7 +37,7 @@
       serviceAccountName: {{ .Values.serviceaccount }}
       containers:
       - name: ofagent
-        image: {{ tpl .Values.images.ofagent.registry . }}{{ tpl .Values.images.ofagent.repository . }}:{{ tpl .Values.images.ofagent.tag . }}
+        image: {{ tpl .Values.images.ofagent.registry . }}{{ tpl .Values.images.ofagent.repository . }}:{{ tpl ( tpl .Values.images.ofagent.tag . ) . }}
         imagePullPolicy: {{ tpl .Values.images.ofagent.pullPolicy . }}
         env:
         - name: CONTROLLER_SERVICE