ext4: Correct ext4_journalled_dirty_folio() conversion

This should use the new folio_buffers() instead of page_has_buffers().
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>

fs/ext4/inode.c

@@ -3589,7 +3589,7 @@ const struct iomap_ops ext4_iomap_report_ops = {
 static bool ext4_journalled_dirty_folio(struct address_space *mapping,
 		struct folio *folio)
 {
-	WARN_ON_ONCE(!page_has_buffers(&folio->page));
+	WARN_ON_ONCE(!folio_buffers(folio));
 	folio_set_checked(folio);
 	return filemap_dirty_folio(mapping, folio);
 }