[dconf] Don't return a value from a void function

[Ryan Lortie <ryanl src gnome org>]

commit cdf709def63b2d63a664aff1120ab9e0cf3a7048
Author: Brian Cameron <brian cameron oracle com>
Date:   Sun Jul 15 11:53:28 2012 -0400

    Don't return a value from a void function
    
    https://bugzilla.gnome.org/show_bug.cgi?id=676619

 tests/gsettings.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/tests/gsettings.c b/tests/gsettings.c
index 89ebb4c..d57f2b9 100644
--- a/tests/gsettings.c
+++ b/tests/gsettings.c
@@ -58,7 +58,7 @@ do_write_tree (GTree *tree)
 static void
 do_sync (void)
 {
-  return G_SETTINGS_BACKEND_GET_CLASS (backend)
+  G_SETTINGS_BACKEND_GET_CLASS (backend)
     ->sync (backend);
 }