[grilo-plugins] lua-factory: Fix use-after-free

[Victor Toso de Carvalho <victortoso src gnome org>]

commit 5a8e01ddb34d8b548fc895941692bc56b5fd8976
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Nov 26 17:48:05 2014 +0100

    lua-factory: Fix use-after-free
    
    When the key type isn't handled, we try to print the key name. Better
    for it not to be freed when we do that.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=740765

 src/lua-factory/grl-lua-library.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/lua-factory/grl-lua-library.c b/src/lua-factory/grl-lua-library.c
index 711e148..6f06018 100644
--- a/src/lua-factory/grl-lua-library.c
+++ b/src/lua-factory/grl-lua-library.c
@@ -796,7 +796,6 @@ grl_l_media_get_keys (lua_State *L)
     }
 
     lua_pushstring (L, key_name);
-    g_free (key_name);
     if (key_id != GRL_METADATA_KEY_INVALID) {
       type = grl_registry_lookup_metadata_key_type (registry, key_id);
       switch (type) {
@@ -819,12 +818,14 @@ grl_l_media_get_keys (lua_State *L)
         } else {
           GRL_DEBUG ("'%s' is being ignored as G_TYPE is not being handled.",
                      key_name);
+          g_free (key_name);
           lua_pop (L, 1);
           continue;
         }
       }
       lua_settable (L, -3);
     }
+    g_free (key_name);
   }
   g_list_free (list_keys);
   return 1;