[evolution] Fix a memory leak of an old setting value from test_utils_fixture_change_setting()

[Milan Crha <mcrha src gnome org>]

commit 601ee0bc8fdf88beb4dd6c9978b9535f2278bdd9
Author: Milan Crha <mcrha redhat com>
Date:   Wed Aug 24 08:15:05 2016 +0200

    Fix a memory leak of an old setting value from test_utils_fixture_change_setting()
    
    It seems the g_settings_get_value() returns already sunk reference
    on the GVariant, thus the g_variant_ref_sink() added a new hard
    reference on it, instead of sink it.

 e-util/test-html-editor-units-utils.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/e-util/test-html-editor-units-utils.c b/e-util/test-html-editor-units-utils.c
index 9e1ee52..8319941 100644
--- a/e-util/test-html-editor-units-utils.c
+++ b/e-util/test-html-editor-units-utils.c
@@ -274,7 +274,7 @@ test_utils_fixture_change_setting (TestFixture *fixture,
        data = g_new0 (TestSettings, 1);
        data->schema = g_strdup (schema);
        data->key = g_strdup (key);
-       data->old_value = g_variant_ref_sink (g_settings_get_value (settings, key));
+       data->old_value = g_settings_get_value (settings, key);
 
        /* Use prepend, thus the restore comes in the opposite order, thus a change
           of the same key is not a problem. */