cloudstack: Use errortext from router in cs_router (#25634)

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

lib/ansible/modules/cloud/cloudstack/cs_router.py

@@ -317,7 +317,7 @@ class AnsibleCloudStackRouter(AnsibleCloudStack):
                 router = self.cs.changeServiceForRouter(**args)
 
                 if 'errortext' in router:
-                    self.module.fail_json(msg="Failed: '%s'" % res['errortext'])
+                    self.module.fail_json(msg="Failed: '%s'" % router['errortext'])
 
                 if state in [ 'restarted', 'started' ]:
                     router = self.start_router()