UPSTREAM: mm: convert collapse_huge_page() to use a folio

Replace three calls to compound_head() with one.

Link: https://lkml.kernel.org/r/20231211162214.2146080-9-willy@infradead.org


Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
(cherry picked from commit 54327268)
Bug: 313807618
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
Change-Id: I0d5049d53b0ca4413b69123b99205772f4e1342a