openqa-server: never register 'changed' for this (check) step

roles/openqa/server/tasks/main.yml

@@ -90,6 +90,7 @@
     chdir: /var/lib/openqa/share/factory/hdd/
   register: diskcheck
   failed_when: "1 != 1"
+  changed_when: "1 != 1"
   always_run: true
 
 - name: Create hard disk images (this may take a long time!)