[TCP]: Make tcp_splice_data_recv() static.

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/tcp.c

@@ -515,7 +515,7 @@ static inline void tcp_push(struct sock *sk, int flags, int mss_now,
 	}
 }
 
-int tcp_splice_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
+static int tcp_splice_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
 				unsigned int offset, size_t len)
 {
 	struct tcp_splice_state *tss = rd_desc->arg.data;