[TCP] splice: add tcp_splice_read() to IPV6

Thanks to YOSHIFUJI Hideaki for the hint!

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index ecbd388..85178f7 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -491,6 +491,7 @@
 	.recvmsg	   = sock_common_recvmsg,	/* ok		*/
 	.mmap		   = sock_no_mmap,
 	.sendpage	   = tcp_sendpage,
+	.splice_read	   = tcp_splice_read,
 #ifdef CONFIG_COMPAT
 	.compat_setsockopt = compat_sock_common_setsockopt,
 	.compat_getsockopt = compat_sock_common_getsockopt,