of segments to mark. However, this may be much more than lfs_nseg.
Originally this wasn't a big problem, since only the structures in the
diskblock were changed, but nowadays there's a mirror of the segflags
in the in-core superblock. This problem caused the code to walk
way past the end of that allocated area, causing memory corruption
in other kernel structures. So, use lfs_nseg as the maximum, as it should be.
While here, simplify the loop; it had become an obfuscated piece of
code overtime.
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