Sean Bruno e2041bfa7c CC Cubic: fix underflow for cubic_cwnd()
Singed calculations in cubic_cwnd() can result in negative cwnd
value which is then cast to an unsigned value. Values less than
1 mss are generally bad for other parts of the code, also fixed.

Submitted by:	Jason Eggleston <jason@eggnet.com>
Sponsored by:	Limelight Networks
Differential Revision:	https://reviews.freebsd.org/D14141
2018-03-26 19:53:36 +00:00
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