jtl 5d68ebcc9d Prevent underflows in tp->snd_wnd if the remote side ACKs more than
tp->snd_wnd. This can happen, for example, when the remote side responds to
a window probe by ACKing the one byte it contains.

Differential Revision:	https://reviews.freebsd.org/D5625
Reviewed by:	hiren
Obtained from:	Juniper Networks (earlier version)
MFC after:	2 weeks
Sponsored by:	Juniper Networks
2016-04-21 15:06:53 +00:00
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