mm/rmap: use folio_large_nr_pages() when we are sure it is a large folio

mm/rmap: use folio_large_nr_pages() when we are sure it is a large folio

Non-large folio is handled at the beginning, so it is a large folio for
sure.

Use folio_large_nr_pages() here like elsewhere.

Link: https://lkml.kernel.org/r/20250817032647.29147-3-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Harry Yoo <harry.yoo@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>