crypto/chcr: fix incorrect ipv6 packet length

IPv6 header's payload length field shouldn't include IPv6 header length.
Signed-off-by: NRohit Maheshwari <rohitm@chelsio.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/crypto/chelsio/chcr_ktls.c

@@ -981,7 +981,7 @@ chcr_ktls_write_tcp_options(struct chcr_ktls_info *tx_info, struct sk_buff *skb,
 		ip->tot_len = htons(pktlen - maclen);
 	} else {
 		ip6 = (struct ipv6hdr *)(buf + maclen);
-		ip6->payload_len = htons(pktlen - maclen);
+		ip6->payload_len = htons(pktlen - maclen - iplen);
 	}
 	/* now take care of the tcp header, if fin is not set then clear push
 	 * bit as well, and if fin is set, it will be sent at the last so we