inet: unexport udp{4|6}_lib_lookup_skb()

These functions do not need to be exported.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20201113113553.3411756-1-eric.dumazet@gmail.comSigned-off-by: NJakub Kicinski <kuba@kernel.org>

net/ipv4/udp.c

@@ -550,7 +550,6 @@ struct sock *udp4_lib_lookup_skb(const struct sk_buff *skb,
 				 iph->daddr, dport, inet_iif(skb),
 				 inet_sdif(skb), &udp_table, NULL);
 }
-EXPORT_SYMBOL_GPL(udp4_lib_lookup_skb);
 
 /* Must be called under rcu_read_lock().
  * Does increment socket refcount.

net/ipv6/udp.c

@@ -285,7 +285,6 @@ struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb,
 				 &iph->daddr, dport, inet6_iif(skb),
 				 inet6_sdif(skb), &udp_table, NULL);
 }
-EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb);
 
 /* Must be called under rcu_read_lock().
  * Does increment socket refcount.