Michael Tuexen 6d261981ee Only update SACK/DSACK lists when a non-empty segment was received.
This fixes hitting a KASSERT with a valid packet exchange.

Reviewed by:		rrs@, Richard Scheffenegger
MFC after:		3 days
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D21567
2019-09-09 16:07:47 +00:00
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