baseaudiosink: use the internal clock time

We can't assume that the internal clock time is the same as the function we
installed on our provided clock because somebody might have changed it.

gst-libs/gst/audio/gstbaseaudiosink.c

@@ -1127,7 +1127,7 @@ gst_base_audio_sink_sync_latency (GstBaseSink * bsink, GstMiniObject * obj)
    * our internal clock should exactly have been the latency (== the running
    * time of the external clock) */
   etime = GST_ELEMENT_CAST (sink)->base_time + time;
-  itime = gst_base_audio_sink_get_time (sink->provided_clock, sink);
+  itime = gst_clock_get_internal_time (sink->provided_clock);
 
   if (status == GST_CLOCK_EARLY) {
     /* when we prerolled late, we have to take into account the lateness */