copr: backend: detect swap is enabled before disabling it

I am not opening a question whether disabling swap is a good idea,
I'm just want to make the execution of the playbook idempotent.

roles/copr/backend/tasks/main.yml

@@ -247,7 +247,12 @@
    fstype: swap
    state: absent
 
+- name: detect if swap is enabled
+  shell: test -n "$(swapon -s)"
+  register: swap_enabled
+  changed_when: false
+  failed_when: false
+
 - name: disable swap so that OOM killer can do his job
-  command: "{{ item }}"
+  command: swapoff -a
-  with_items:
+  when: swap_enabled.rc != 0
-  - swapoff -a