[devhelp] book-manager: fix leaked GVariantBuilder

[Aleksander Morgado <aleksm src gnome org>]

commit 0e31576f517dcfc487115a4ed9b93b2fb35ca715
Author: Pavel Vasin <rat4vier gmail com>
Date:   Fri Dec 21 22:12:59 2012 +0400

    book-manager: fix leaked GVariantBuilder

 src/dh-book-manager.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/dh-book-manager.c b/src/dh-book-manager.c
index 9e4f70a..beb2b3f 100644
--- a/src/dh-book-manager.c
+++ b/src/dh-book-manager.c
@@ -316,6 +316,7 @@ book_manager_store_books_disabled (DhBookManager *book_manager)
         }
 
         variant = g_variant_builder_end (builder);
+        g_variant_builder_unref (builder);
 
         g_settings_set_value (
                 dh_settings_peek_contents_settings (priv->settings),