tcp: Rename tb in inet_bind2_bucket_(init|create)().

Later, we no longer link sockets to bhash.  Instead, each bhash2
bucket is linked to the corresponding bhash bucket.

Then, we pass the bhash bucket to bhash2 allocation functions as
tb.  However, tb is already used in inet_bind2_bucket_create() and
inet_bind2_bucket_init() as the bhash2 bucket.

To make the following diff clear, let's use tb2 for the bhash2 bucket
there.
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/inet_hashtables.c

@@ -100,30 +100,30 @@ bool inet_bind_bucket_match(const struct inet_bind_bucket *tb, const struct net
 		tb->l3mdev == l3mdev;
 }
 
-static void inet_bind2_bucket_init(struct inet_bind2_bucket *tb,
+static void inet_bind2_bucket_init(struct inet_bind2_bucket *tb2,
 				   struct net *net,
 				   struct inet_bind_hashbucket *head,
 				   unsigned short port, int l3mdev,
 				   const struct sock *sk)
 {
-	write_pnet(&tb->ib_net, net);
-	tb->l3mdev    = l3mdev;
-	tb->port      = port;
+	write_pnet(&tb2->ib_net, net);
+	tb2->l3mdev = l3mdev;
+	tb2->port = port;
 #if IS_ENABLED(CONFIG_IPV6)
 	BUILD_BUG_ON(USHRT_MAX < (IPV6_ADDR_ANY | IPV6_ADDR_MAPPED));
 	if (sk->sk_family == AF_INET6) {
-		tb->addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
-		tb->v6_rcv_saddr = sk->sk_v6_rcv_saddr;
+		tb2->addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
+		tb2->v6_rcv_saddr = sk->sk_v6_rcv_saddr;
 	} else {
-		tb->addr_type = IPV6_ADDR_MAPPED;
-		ipv6_addr_set_v4mapped(sk->sk_rcv_saddr, &tb->v6_rcv_saddr);
+		tb2->addr_type = IPV6_ADDR_MAPPED;
+		ipv6_addr_set_v4mapped(sk->sk_rcv_saddr, &tb2->v6_rcv_saddr);
 	}
 #else
-	tb->rcv_saddr = sk->sk_rcv_saddr;
+	tb2->rcv_saddr = sk->sk_rcv_saddr;
 #endif
-	INIT_HLIST_HEAD(&tb->owners);
-	INIT_HLIST_HEAD(&tb->deathrow);
-	hlist_add_head(&tb->node, &head->chain);
+	INIT_HLIST_HEAD(&tb2->owners);
+	INIT_HLIST_HEAD(&tb2->deathrow);
+	hlist_add_head(&tb2->node, &head->chain);
 }
 
 struct inet_bind2_bucket *inet_bind2_bucket_create(struct kmem_cache *cachep,
@@ -133,12 +133,12 @@ struct inet_bind2_bucket *inet_bind2_bucket_create(struct kmem_cache *cachep,
 						   int l3mdev,
 						   const struct sock *sk)
 {
-	struct inet_bind2_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC);
+	struct inet_bind2_bucket *tb2 = kmem_cache_alloc(cachep, GFP_ATOMIC);
 
-	if (tb)
-		inet_bind2_bucket_init(tb, net, head, port, l3mdev, sk);
+	if (tb2)
+		inet_bind2_bucket_init(tb2, net, head, port, l3mdev, sk);
 
-	return tb;
+	return tb2;
 }
 
 /* Caller must hold hashbucket lock for this tb with local BH disabled */