baseaudiosink: Resync when ringbuffer resets

When the ringbuffer gets restarted (like in setcaps), we *will* have
to resync against the new values.

Without this we end up blindly assuming the new samples align to the
old ones.

Conflicts:
	gst-libs/gst/audio/gstbaseaudiosink.c

gst-plugins-base/gst-libs/gst/audio/gstbaseaudiosink.c

@@ -921,6 +921,12 @@ gst_base_audio_sink_setcaps (GstBaseSink * bsink, GstCaps * caps)
   if (!gst_ring_buffer_acquire (sink->ringbuffer, spec))
     goto acquire_error;
 
+  /* We need to resync since the ringbuffer restarted */
+  sink->priv->avg_skew = -1;
+  sink->next_sample = -1;
+  sink->priv->eos_time = -1;
+  sink->priv->discont_time = -1;
+
   if (bsink->pad_mode == GST_ACTIVATE_PUSH) {
     GST_DEBUG_OBJECT (sink, "activate ringbuffer");
     gst_ring_buffer_activate (sink->ringbuffer, TRUE);