hpfs: Convert symlinks to read_folio

This is a "weak" conversion which converts straight back to using pages.
A full conversion should be performed at some point, hopefully by
someone familiar with the filesystem.

Signed-off-by: Matthew Wilcox (Oracle) <[e-mail]>

fs/hpfs/namei.c

···
 	return err;
 }
 
-static int hpfs_symlink_readpage(struct file *file, struct page *page)
+static int hpfs_symlink_read_folio(struct file *file, struct folio *folio)
 {
+	struct page *page = &folio->page;
 	char *link = page_address(page);
 	struct inode *i = page->mapping->host;
 	struct fnode *fnode;
···
 }
 
 const struct address_space_operations hpfs_symlink_aops = {
-	.readpage	= hpfs_symlink_readpage
+	.read_folio	= hpfs_symlink_read_folio
 };
 
 static int hpfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,