[NET]: Revert incorrect accept queue backlog changes.
This reverts two changes: 8488df89 248f0672 A backlog value of N really does mean allow "N + 1" connections to queue to a listening socket. This allows one to specify "0" as the backlog and still get 1 connection. Noticed by Gerrit Renker and Rick Jones. Signed-off-by: David S. Miller <email@example.com>
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