Harden export resolution checks in GetExportedProcAddress

[tishion]

Motivation

• Prevent out-of-bounds reads and null-dereferences when resolving exported symbols from modules with missing or malformed export directories.
• Make export lookup resilient to inconsistent export table metadata (zeroed addresses, mismatched counts, or out-of-range ordinals).

Description

• In GetExportedProcAddress (src/mmLoader/mmLoader.c) return NULL early if the export DataDirectory has a zero VirtualAddress or Size.
• Validate PIMAGE_EXPORT_DIRECTORY fields by returning NULL when NumberOfNames or NumberOfFunctions are zero.
• Return NULL if any of AddressOfNames, AddressOfNameOrdinals, or AddressOfFunctions is zero before dereferencing them.
• Iterate by NumberOfNames when scanning names and guard each resolved ordinal with a bounds check against NumberOfFunctions to avoid indexing past the functions table.

Testing

• No automated tests were run for this change.

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Codex Task

[tishion]

AddressOfNames and AddressOfNameOrdinals could be zero and it is correct in a PE file format