inet: rename ir_loc_port to ir_num

In commit 634fb979e8f ("inet: includes a sock_common in request_sock")
I forgot that the two ports in sock_common do not have same byte order :

skc_dport is __be16 (network order), but skc_num is __u16 (host order)

So sparse complains because ir_loc_port (mapped into skc_num) is
considered as __u16 while it should be __be16

Let rename ir_loc_port to ireq->ir_num (analogy with inet->inet_num),
and perform appropriate htons/ntohs conversions.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 24a0616..1db3a01 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1110,7 +1110,7 @@
 	ireq->acked = 0;
 	ireq->ecn_ok = 0;
 	ireq->ir_rmt_port = tcp_hdr(skb)->source;
-	ireq->ir_loc_port = tcp_hdr(skb)->dest;
+	ireq->ir_num = ntohs(tcp_hdr(skb)->dest);
 }
 
 void tcp_enter_memory_pressure(struct sock *sk);