fixed lava repo for buster

Change-Id: I73e2e9adac96570d98fed4f210cfeb4d1b9cad27
diff --git a/playbooks/roles/lab-lava-repo/tasks/main.yml b/playbooks/roles/lab-lava-repo/tasks/main.yml
index 0c4cd61..e34bcfd 100644
--- a/playbooks/roles/lab-lava-repo/tasks/main.yml
+++ b/playbooks/roles/lab-lava-repo/tasks/main.yml
@@ -14,7 +14,7 @@
 
  - name: Adding LAVA buster repo
    copy: src=lava-buster.list dest=/etc/apt/sources.list.d/lava.list owner=root group=root mode=644
-   when: ansible_distribution_release == "buster"
+   when: ansible_lsb.codename == "buster"
 
  - name: Update apt
    apt: update_cache=yes