updated to verify the exit code of killall, only report a change if something is killed

roles/reset/tasks/main.yml

@@ -10,9 +10,10 @@
     - k3s-node
 
 - name: Killall containerd-shim-runc-v2
+  register: killall_containerd_shim_runc_v2
   command: killall -9 containerd-shim-runc-v2
+  changed_when: "killall_containerd_shim_runc_v2.rc == 0"
   failed_when: false
-  changed_when: false
 
 - name: Umount k3s filesystems
   include_tasks: umount_with_childeren.yml