[File] Detect YAFFS images

[Fabian Zaremba]

Hello FC,

thank you very much for the suggestion!

Indeed, matching this way will reduce false-positives. Attached is the 
improved patch, which passes my tests.

Am I correct in assuming that removing the ulelong / ubelong lines for 
the invalid enum values (0 & >5) will not further reduce false positives?

Best regards,
Fabian
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