mkfs.jffs2.c rework

[David Woodhouse]

joakim.tjernlund at lumentis.se said:
>  If my memory serves me correct, I think the semantics of the clean
> marker has changed somewhat. A clean erase block with only a clean
> maker on it will have the ACCURATE bit set, but once you write to it
> you should clear the ACCURATE bit. This is an optimization that
> enables JFFS2 to avoid scanning empty erase blocks. 

Er, I'm not convinced we ever actually did that. You may be right though.

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dwmw2