memory: hugetlbfs mapping may not be invalid
memory: hugetlbfs mapping may not be invalid

Turn a condition into an assert() since if a mapping is invalid this may
only mean that we have a bug.

Signed-off-by: Vlad Zolotarov <976c0f8d0852ed6439ad273880b400a75a7c41d0@cloudius-systems.com>

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