[libdazzle] shortcuts: release return value GValue

[Christian Hergert <chergert src gnome org>]

commit c61c06e9687d36f5f0871a7e6929541c013fbfc1
Author: Christian Hergert <chergert redhat com>
Date:   Wed Jul 25 19:05:11 2018 -0700

    shortcuts: release return value GValue
    
    Make sure that we release the return value if there is any for the
    call. In most cases there isn't.

 src/shortcuts/dzl-shortcut-closure-chain.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/src/shortcuts/dzl-shortcut-closure-chain.c b/src/shortcuts/dzl-shortcut-closure-chain.c
index a16b8ee..2db9572 100644
--- a/src/shortcuts/dzl-shortcut-closure-chain.c
+++ b/src/shortcuts/dzl-shortcut-closure-chain.c
@@ -358,6 +358,9 @@ signal_activate (DzlShortcutClosureChain *chain,
     g_value_unset (&params[i]);
   g_free (params);
 
+  if (query.return_type != G_TYPE_NONE)
+    g_value_unset (&return_value);
+
   return GDK_EVENT_STOP;
 
 parameter_mismatch: