Pull up following revision(s) (requested by sborrill in ticket #308):
sbin/resize_ffs/resize_ffs.8: revision 1.18
sbin/resize_ffs/resize_ffs.c: revision 1.48-1.53
Fix the most obvious integer overflow errors which can lead to superblock
corruption. Thanks to riastradh@
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Use int64_t for loop index so we don't iterate forever/until trap.
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Fix the syntax (pointed out by David H. Gutteridge on source-changes-d).
Fix the build...
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- More fixes to use 64bit offsets.
- Compute left-over fragments also for FFS2.
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PR/52590: David H. Gutteridge: Minor documentation improvements
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Fix computation of left-over fragments also for ufs2.
Fixes PR 52600.

(snj)