fb_defio: use a folio in fb_deferred_io_work()

Replaces three calls to compound_head() with one, which removes last
caller of page_mkclean().

Link: https://lkml.kernel.org/r/20240604114822.2089819-4-wangkefeng.wang@huawei.comSigned-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Helge Deller <deller@gmx.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

drivers/video/fbdev/core/fb_defio.c

@@ -244,10 +244,11 @@ static void fb_deferred_io_work(struct work_struct *work)
 	/* here we mkclean the pages, then do all deferred IO */
 	mutex_lock(&fbdefio->lock);
 	list_for_each_entry(pageref, &fbdefio->pagereflist, list) {
-		struct page *cur = pageref->page;
-		lock_page(cur);
-		page_mkclean(cur);
-		unlock_page(cur);
+		struct folio *folio = page_folio(pageref->page);
+
+		folio_lock(folio);
+		folio_mkclean(folio);
+		folio_unlock(folio);
 	}
 
 	/* driver's callback with pagereflist */