CI: fix exit condition

.gitlab-ci.yml

@@ -30,7 +30,7 @@ check:
     - echo -n "${ANSIBLE_VAULT_PASSWORD}" > .ansible_vault_pw
     - export ANSIBLE_VAULT_PASSWORD_FILE=.ansible_vault_pw
     - with-ssh-key ansible-playbook -i hosts.ini --diff --check site.yml
-    - grep changed= ansible.log | grep -v changed=0 && false
+    - grep changed= ansible.log | grep -q -v changed=0 && false
   artifacts:
     paths:
       - ansible.log