[glib] tests: Fix some minor memory leaks in gdbus-test-codegen

[Philip Withnall <pwithnall src gnome org>]

commit a2a4a10299bfcc4bfd63599a9b4d9e7465516e43
Author: Philip Withnall <withnall endlessm com>
Date:   Wed Nov 15 12:27:16 2017 +0000

    tests: Fix some minor memory leaks in gdbus-test-codegen
    
    It’s not entirely leak-free, but it’s better than before.
    
    Signed-off-by: Philip Withnall <withnall endlessm com>
    
    https://bugzilla.gnome.org/show_bug.cgi?id=741167

 gio/tests/gdbus-test-codegen.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/gio/tests/gdbus-test-codegen.c b/gio/tests/gdbus-test-codegen.c
index c54c7ac..c974d20 100644
--- a/gio/tests/gdbus-test-codegen.c
+++ b/gio/tests/gdbus-test-codegen.c
@@ -897,6 +897,11 @@ check_bar_proxy (FooiGenBar *proxy,
   g_assert_no_error (error);
   g_assert (ret);
 
+  g_clear_pointer (&ret_val_string, g_free);
+  g_clear_pointer (&ret_val_objpath, g_free);
+  g_clear_pointer (&ret_val_signature, g_free);
+  g_clear_pointer (&ret_val_bytestring, g_free);
+
   error = NULL;
   array_of_signatures = g_variant_ref_sink (g_variant_new_parsed ("[@g 'ass', 'git']"));
   ret = foo_igen_bar_call_test_non_primitive_types_sync (proxy,