[gstreamermm] Gst::Clock: implement destroy callback for wait_async()

[Marcin Kolny <mkolny src gnome org>]

commit a44277017bc2b0afc04f110df1274eb05e143d9a
Author: Marcin Kolny <marcin kolny gmail com>
Date:   Sat Aug 27 15:20:07 2016 +0200

    Gst::Clock: implement destroy callback for wait_async()

 gstreamer/src/clock.ccg |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/gstreamer/src/clock.ccg b/gstreamer/src/clock.ccg
index e629927..8b1c6fe 100644
--- a/gstreamer/src/clock.ccg
+++ b/gstreamer/src/clock.ccg
@@ -47,6 +47,12 @@ static gboolean ClockID_Clock_gstreamermm_callback(GstClock* clock, GstClockTime
   return false;
 }
 
+
+static void ClockID_Clock_gstreamermm_callback_destroy(void* data)
+{
+  delete static_cast<Gst::ClockID::SlotClock*>(data);
+}
+
 } // extern "C"
 
 } // anonymous namespace
@@ -57,7 +63,7 @@ namespace Gst
 ClockReturn ClockID::wait_async(const SlotClock& slot)
 {
   SlotClock* slot_copy = new SlotClock(slot);
-  return static_cast<ClockReturn>(gst_clock_id_wait_async(gobj(), &ClockID_Clock_gstreamermm_callback, 
slot_copy, nullptr)); // TODO temporary NULL value
+  return static_cast<ClockReturn>(gst_clock_id_wait_async(gobj(), &ClockID_Clock_gstreamermm_callback, 
slot_copy, &ClockID_Clock_gstreamermm_callback_destroy));
 }
 
 }