net/tls: remove a duplicate function prototype

Remove one of the two instances of the function prototype for
tls_validate_xmit_skb().

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Boris Pismenny <borisp@nvidia.com>
Cc: Aviad Yehezkel <aviadye@nvidia.com>
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/tls.h

@@ -679,10 +679,6 @@ int decrypt_skb(struct sock *sk, struct sk_buff *skb,
 		struct scatterlist *sgout);
 struct sk_buff *tls_encrypt_skb(struct sk_buff *skb);
 
-struct sk_buff *tls_validate_xmit_skb(struct sock *sk,
-				      struct net_device *dev,
-				      struct sk_buff *skb);
-
 int tls_sw_fallback_init(struct sock *sk,
 			 struct tls_offload_context_tx *offload_ctx,
 			 struct tls_crypto_info *crypto_info);