ipv6: remove printk

ipv6_find_hdr() prints a non-rate limited error message
when it cannot find an ipv6 header at a specific offset.
This could be used as a DoS, so just remove it.
Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/exthdrs_core.c

@@ -197,10 +197,8 @@ int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
 		struct ipv6hdr _ip6, *ip6;
 
 		ip6 = skb_header_pointer(skb, *offset, sizeof(_ip6), &_ip6);
-		if (!ip6 || (ip6->version != 6)) {
-			printk(KERN_ERR "IPv6 header not found\n");
+		if (!ip6 || (ip6->version != 6))
 			return -EBADMSG;
-		}
 		start = *offset + sizeof(struct ipv6hdr);
 		nexthdr = ip6->nexthdr;
 	}