Revert "tcp: disallow bind() to reuse addr/port"
This reverts commit c191a836. It causes known regressions for programs that expect to be able to use SO_REUSEADDR to shutdown a socket, then successfully rebind another socket to the same ID. Programs such as haproxy and amavisd expect this to work. This should fix kernel bugzilla 32832. Signed-off-by: David S. Miller <davem@davemloft.net>
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