net: udp: remove redundant initialization in udp_dump_one

The initialization for 'err' with '-EINVAL' is redundant and
can be removed, as it is updated soon and not used.
Signed-off-by: Menglong Dong <dong.menglong@zte.com.cn>
Link: https://lore.kernel.org/r/1604644960-48378-2-git-send-email-dong.menglong@zte.com.cnSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/ipv4/udp_diag.c

@@ -30,7 +30,7 @@ static int udp_dump_one(struct udp_table *tbl,
 			const struct inet_diag_req_v2 *req)
 {
 	struct sk_buff *in_skb = cb->skb;
-	int err = -EINVAL;
+	int err;
 	struct sock *sk = NULL;
 	struct sk_buff *rep;
 	struct net *net = sock_net(in_skb->sk);