K 10
svn:author
V 7
git2svn
K 8
svn:date
V 27
2022-09-25T10:05:44.528770Z
K 7
svn:log
V 569
tcp: fix computation of offset

Only update the offset if actually retransmitting from the
scoreboard. If not done correctly, this may result in
trying to (re)-transmit data not being being in the socket
buffe and therefore resulting in a panic.

PR:			264257
PR:			263445
PR:			260393
Reviewed by:		rscheff@
MFC after:		3 days
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D36626

(cherry picked from commit 6d9e911fbadf3b409802a211c1dae9b47cb5a2b8)

Git Hash:   26370413d43bfd65500270ff331ae6bdf0f54133
Git Author: tuexen@FreeBSD.org
END