[glib] Fix g_subprocess_launcher_spawn

[Matthias Clasen <matthiasc src gnome org>]

commit 7ef1eccd7e97baee34e3ff76f1e19cdefc1b9eb8
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Nov 28 01:34:52 2013 -0500

    Fix g_subprocess_launcher_spawn
    
    This function turns a varargs argument list into a string array,
    but forgets to NULL-terminate it. This function was not covered
    by unit tests...so it was broken.

 gio/gsubprocesslauncher.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gio/gsubprocesslauncher.c b/gio/gsubprocesslauncher.c
index d6463e3..96f8454 100644
--- a/gio/gsubprocesslauncher.c
+++ b/gio/gsubprocesslauncher.c
@@ -701,6 +701,8 @@ g_subprocess_launcher_spawn (GSubprocessLauncher  *launcher,
   while ((arg = va_arg (ap, const gchar *)))
     g_ptr_array_add (args, (gchar *) arg);
 
+  g_ptr_array_add (args, NULL);
+
   result = g_subprocess_launcher_spawnv (launcher, (const gchar * const *) args->pdata, error);
 
   g_ptr_array_free (args, TRUE);