[ole32/stg_bigblockfile] Check page before use (Coverity)

[Paul Vriens]

Hi,

Either check page before using it or get rid of the checks (the ERR suggests
this should never happen), I've opted for the first.

Should fix Coverity CID-528 (actually 2 of them with the same number).

Changelog
    Check page before use

Cheers,

Paul.


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