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Fix heap-buffer-overflow in legacy maps section parsing

The map_count computation used ceiling division when the section size
was not evenly divisible by map_record_size, which can produce a count
whose last record extends past the section data buffer. This causes a
heap-buffer-overflow when the platform's parse_maps_section callback
iterates all records.

Fix by using floor division, and add a pre-call bounds check as a
safety invariant to prevent future regressions.

Signed-off-by: Michael Agun <danielagun@microsoft.com>

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