[gnome-games] libretro: Fix a missing async callback

[Adrien Plazas <aplazas src gnome org>]

commit 66b2625cec67f2f8d72a1a197d36e7502f71909e
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Sun Feb 26 08:00:27 2017 +0100

    libretro: Fix a missing async callback
    
    Add a missing callback before a yield in LibretroGameSource.each_game(),
    avoiding to stop loading games prematurily.

 plugins/libretro/src/libretro-game-source.vala |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/plugins/libretro/src/libretro-game-source.vala b/plugins/libretro/src/libretro-game-source.vala
index 774cb3e..eaf1c2b 100644
--- a/plugins/libretro/src/libretro-game-source.vala
+++ b/plugins/libretro/src/libretro-game-source.vala
@@ -13,6 +13,8 @@ public class Games.LibretroGameSource : Object, GameSource {
                foreach (var core_descriptor in descriptors) {
                        var game = game_for_core_descriptor (core_descriptor);
                        callback (game);
+
+                       Idle.add (each_game.callback);
                        yield;
                }
        }