net/sched: remove return value of unregister_tcf_proto_ops

Return value of unregister_tcf_proto_ops is unused, remove it.
Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/pkt_cls.h

@@ -23,7 +23,7 @@ struct tcf_walker {
 };
 
 int register_tcf_proto_ops(struct tcf_proto_ops *ops);
-int unregister_tcf_proto_ops(struct tcf_proto_ops *ops);
+void unregister_tcf_proto_ops(struct tcf_proto_ops *ops);
 
 struct tcf_block_ext_info {
 	enum flow_block_binder_type binder_type;

net/sched/cls_api.c

@@ -194,7 +194,7 @@ EXPORT_SYMBOL(register_tcf_proto_ops);
 
 static struct workqueue_struct *tc_filter_wq;
 
-int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
+void unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
 {
 	struct tcf_proto_ops *t;
 	int rc = -ENOENT;
@@ -214,7 +214,8 @@ int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
 		}
 	}
 	write_unlock(&cls_mod_lock);
-	return rc;
+
+	WARN(rc, "unregister tc filter kind(%s) failed %d\n", ops->kind, rc);
 }
 EXPORT_SYMBOL(unregister_tcf_proto_ops);