Fix a bug in the hack that protects against FTP bounce attacks.

It used to loop back up to the accept() call and block there,
shutting out all other transports until a new connection came in.
Now it returns instead after dropping the connection.  That will
take it back to the select() loop where all transports can be
serviced.  I intend to MFC this within a day or two since it
fixes a DoS vulnerability.

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