Possible burst from TCP NewReno when a partial ACK is received

[Noritoshi Demizu]

Quoted from http://leaf.dragonflybsd.org/mailarchive/bugs/2005-08/msg00051.html
> I'd like to commit the patch below if no objection is raised
> until August 28, 2005.

Thanks. committed.

Regards,
Noritoshi Demizu