[gnome-control-center] keyboard: Fix a memory leak

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 870fb462019701f7c0bdf2f1cdeefa94f2575e67
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Jun 29 16:42:43 2017 +0200

    keyboard: Fix a memory leak
    
    While the actual strings returned by g_variant_get_strv() are owned
    by the variant, we still need to free the container ...
    
    https://bugzilla.gnome.org/show_bug.cgi?id=784356

 panels/keyboard/cc-keyboard-manager.c |   12 +++++++++---
 1 files changed, 9 insertions(+), 3 deletions(-)
---
diff --git a/panels/keyboard/cc-keyboard-manager.c b/panels/keyboard/cc-keyboard-manager.c
index 84e1e15..7e47b29 100644
--- a/panels/keyboard/cc-keyboard-manager.c
+++ b/panels/keyboard/cc-keyboard-manager.c
@@ -87,12 +87,18 @@ free_key_array (GPtrArray *keys)
 static const gchar*
 get_binding_from_variant (GVariant *variant)
 {
+  const char *str, **strv;
+
   if (g_variant_is_of_type (variant, G_VARIANT_TYPE_STRING))
     return g_variant_get_string (variant, NULL);
-  else if (g_variant_is_of_type (variant, G_VARIANT_TYPE_STRING_ARRAY))
-    return g_variant_get_strv (variant, NULL)[0];
+  else if (!g_variant_is_of_type (variant, G_VARIANT_TYPE_STRING_ARRAY))
+    return NULL;
+
+  strv = g_variant_get_strv (variant, NULL);
+  str = strv[0];
+  g_free (strv);
 
-  return NULL;
+  return str;
 }
 
 static gboolean