yum: fix state=latest (#28547)

lib/ansible/modules/packaging/os/yum.py

@@ -1104,6 +1104,8 @@ def latest(module, items, repoq, yum_basecmd, conf_file, en_repos, dis_repos, in
         if not out_lower.endswith("no packages marked for update") and \
                 not out_lower.endswith("nothing to do"):
             res['changed'] = True
+    else:
+        rc, out, err = [0, '', '']
 
     res['rc'] = rc
     res['msg'] += err