[devhelp] Book: free instance variables in the same order as in the struct

[Sébastien Wilmet <swilmet src gnome org>]

commit 7e152214dc53e72d7ca7803d659568fb581916df
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sun Dec 10 10:32:59 2017 +0100

    Book: free instance variables in the same order as in the struct
    
    It's easier to check that everything is freed.

 src/dh-book.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/dh-book.c b/src/dh-book.c
index ca60b9e..55616ab 100644
--- a/src/dh-book.c
+++ b/src/dh-book.c
@@ -111,12 +111,12 @@ dh_book_finalize (GObject *object)
         priv = dh_book_get_instance_private (DH_BOOK (object));
 
         g_clear_object (&priv->index_file);
+        g_free (priv->id);
+        g_free (priv->title);
+        g_free (priv->language);
         _dh_util_free_book_tree (priv->tree);
         g_list_free_full (priv->links, (GDestroyNotify)dh_link_unref);
         g_list_free_full (priv->completions, g_free);
-        g_free (priv->language);
-        g_free (priv->title);
-        g_free (priv->id);
 
         G_OBJECT_CLASS (dh_book_parent_class)->finalize (object);
 }