extern int udp_sendpage(struct sock *sk, struct page *page, int offset,
size_t size, int flags);
extern int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb);
-extern int udp_destroy_sock(struct sock *sk);
+extern void udp_destroy_sock(struct sock *sk);
#ifdef CONFIG_PROC_FS
extern int udp4_seq_show(struct seq_file *seq, void *v);