netfilter: CLUSTERIP: clusterip_seq_stop() fix

If clusterip_seq_start() memory allocation fails, we crash later in
clusterip_seq_start(), trying to kfree(ERR_PTR(-ENOMEM))
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>

net/ipv4/netfilter/ipt_CLUSTERIP.c

@@ -599,6 +599,7 @@ static void *clusterip_seq_next(struct seq_file *s, void *v, loff_t *pos)
 
 static void clusterip_seq_stop(struct seq_file *s, void *v)
 {
+	if (!IS_ERR(v))
 		kfree(v);
 }