ufs_rename(): fix bogus argument of folio_release_kmap()

new_dir does *NOT* point into dir_folio - it's an inode, not a pointer
to ufs directory entry.

Fixes: 516b97cf "ufs: Convert directory handling to kmap_local"
Acked-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/ufs/namei.c

@@ -307,7 +307,7 @@ static int ufs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 		if (old_dir != new_dir)
 			ufs_set_link(old_inode, dir_de, dir_folio, new_dir, 0);
 		else
-			folio_release_kmap(dir_folio, new_dir);
+			folio_release_kmap(dir_folio, dir_de);
 		inode_dec_link_count(old_dir);
 	}
 	return 0;