arm64: mte: set VM_MTE_ALLOWED for hugetlbfs at correct place

arm64: mte: set VM_MTE_ALLOWED for hugetlbfs at correct place

The commit 5de195060b2e ("mm: resolve faulty mmap_region() error path
behaviour") moved vm flags validation before fop->mmap for file
mappings.  But when commit 25c17c4b55de ("hugetlb: arm64: add mte support")
was rebased on top of it, the hugetlbfs part was missed.  Mmapping
hugetlbfs file may not have MAP_HUGETLB set.

Fixes: 25c17c4b55de ("hugetlb: arm64: add mte support")
Signed-off-by: Yang Shi <yang@os.amperecomputing.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20241119200914.1145249-1-yang@os.amperecomputing.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>