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git2svn
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svn:date
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2021-02-02T21:15:38.665063Z
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V 356
fstyp(8): fix exfat detection

In the presence of high-level errors (spec violations, bad boot blocks
checksum), report non-detection instead of detection.

PR:	252787 (related, but does not fully address)
(cherry picked from commit ddf61156132b610915325769cbb93ea11be0d433)

Git Hash:   a072e2133ed36f1edf899068e6b026b129c919d8
Git Author: cem@FreeBSD.org
END