mm/hugetlb: pass folio instead of page to unmap_ref_private()

mm/hugetlb: pass folio instead of page to unmap_ref_private()

Patch series "Let unmap_hugepage_range() and several related functions
take folio instead of page", v4.

This patch (of 4):

unmap_ref_private() has only a single user, which passes in &folio->page.
Let it take the folio directly.

Link: https://lkml.kernel.org/r/20250505182345.506888-2-nifan.cxl@gmail.com
Link: https://lkml.kernel.org/r/20250505182345.506888-3-nifan.cxl@gmail.com
Signed-off-by: Fan Ni <fan.ni@samsung.com>
Reviewed-by: Muchun Song <muchun.song@linux.dev>
Reviewed-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: "Vishal Moola (Oracle)" <vishal.moola@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>