tbeu / matio / #1091

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Fix memory leak

Mat_VarGetStructs/Mat_VarGetStructsLinear: Remove mem_conserve flag from struct_slab. Previously, mem_conserve was set on the slab itself to prevent Mat_VarFree from freeing the borrowed field pointers. This also prevented freeing the freshly allocated data array, causing a leak. Instead, set mem_conserve only on the individual shallow field duplicates so that Mat_VarFree correctly frees the slab's data array while preserving the original field data.

As reported by https://issues.oss-fuzz.com/512605551

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