mm/hugetlb: use a folio in hugetlb_fault()

We can replace seven implicit calls to compound_head() with one by using
folio.

[[email protected]: update comment, per Sidhartha]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: ZhangPeng <[email protected]>
Reviewed-by Sidhartha Kumar <[email protected]>
Reviewed-by: Matthew Wilcox (Oracle) <[email protected]>
Reviewed-by: Muchun Song <[email protected]>
Cc: Kefeng Wang <[email protected]>
Cc: Mike Kravetz <[email protected]>
Cc: Nanyong Sun <[email protected]>
Cc: Vishal Moola (Oracle) <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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