ole32: Return END_OF_CHAIN for chains starting with special sector values

[Nikolay Sivov]

Compound file format allows only ENDOFCHAIN sectors at this point, and 
that's what our code handles. For files that don't comply with that rule 
special sector value get to far into reading code, that will fail obviously.

I talked with Vincent about that and he suggested to go with minimal fix 
like that.
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