maint: update the mbsalign module

[Pádraig Brady]

I'm updating this module with a view to fixing
alignment issues in df etc. soon.

This fixes an unlikely over truncation bug
and cleans up the interface so that one doesn't
have to check for errors in all cases.

I've also synced this with the util-linux-ng project
for alignment in cal and fdisk et. al. there.

cheers,
Pádraig.

coreutils-ambsalign.diff
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