inet: Remove unused sk_sndmsg_* from UFO

UFO doesn't really use the sk_sndmsg_* parameters so touching
them is pointless. It can't use them anyway since the whole
point of UFO is to use the original pages without copying.

Signed-off-by: Herbert Xu <[e-mail]>
Acked-by: Eric Dumazet <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/core/skbuff.c

···
 			return -ENOMEM;
 
 		/* initialize the next frag */
-		sk->sk_sndmsg_page = page;
-		sk->sk_sndmsg_off = 0;
 		skb_fill_page_desc(skb, frg_cnt, page, 0, 0);
 		skb->truesize += PAGE_SIZE;
 		atomic_add(PAGE_SIZE, &sk->sk_wmem_alloc);
···
 			return -EFAULT;
 
 		/* copy was successful so update the size parameters */
-		sk->sk_sndmsg_off += copy;
 		frag->size += copy;
 		skb->len += copy;
 		skb->data_len += copy;

net/ipv4/ip_output.c

···
 
 		skb->ip_summed = CHECKSUM_PARTIAL;
 		skb->csum = 0;
-		sk->sk_sndmsg_off = 0;
 
 		/* specify the length of each IP datagram fragment */
 		skb_shinfo(skb)->gso_size = mtu - fragheaderlen;

net/ipv6/ip6_output.c

···
 
 		skb->ip_summed = CHECKSUM_PARTIAL;
 		skb->csum = 0;
-		sk->sk_sndmsg_off = 0;
 	}
 
 	err = skb_append_datato_frags(sk,skb, getfrag, from,