kern/58724: Pull up FFS signed/unsigned fixes from chs

[John.P.Darrow%gmail.com@localhost]

>Number:         58724
>Category:       kern
>Synopsis:       Pull up FFS signed/unsigned fixes from chs
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Oct 07 00:40:00 +0000 2024
>Originator:     John Darrow
>Release:        NetBSD 10.0
>Organization:
buried here somewhere
>Environment:
>Description:
Shortly after -10 was branched, chs applied a couple of fix sets (ported from mckusick@FreeBSD) to HEAD for signed/unsigned issues in ffs code, as documented in the following two source-changes messages:

http://mail-index.netbsd.org/source-changes/2023/01/07/msg142678.html

http://mail-index.netbsd.org/source-changes/2023/01/08/msg142682.html

These fixes appear, by inspection, as if they ought to also get pulled up at least to -10, but it does not appear that any pullup request was sent.

(It's possible they might also be appropriate for -9, but I don't know if any of them are also dependent on other changes that happened between -9 and -10, particularly the addition of UFS2ea support.)

noted on icb, Riastradh@ requested I file a PR to track this.
>How-To-Repeat:
See fixes while paging through old source-changes messages, note lack of having seen any matching pullups to -10, confirm said lack by checking a selected few of the involved files via cvsweb.
>Fix:
pull up the changes found in the two messages to -10, hopefully before 10.1 is tagged.