tcp: Rearrange tests in inet_bind2_bucket_(addr_match|match_addr_any)().

The protocol family tests in inet_bind2_bucket_addr_match() and
inet_bind2_bucket_match_addr_any() are ordered as follows.

  if (sk->sk_family != tb2->family)
  else if (sk->sk_family == AF_INET6)
  else

This patch rearranges them so that AF_INET6 socket is handled first
to make the following patch tidy, where tb2->family will be removed.

  if (sk->sk_family == AF_INET6)
  else if (tb2->family == AF_INET6)
  else

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>