ASoC: pcm: If pmdown_time is zero then shut down DAPM immediately

Since we've already got logic to special case immediate teardown of the
stream we may as well use it if the pmdown_time has been set to zero by
the application layer instead of scheduling a work item with zero delay.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>
diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index 121318d..15816ec 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -369,7 +369,7 @@
 	cpu_dai->runtime = NULL;
 
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
-		if (codec->ignore_pmdown_time ||
+		if (!rtd->pmdown_time || codec->ignore_pmdown_time ||
 		    rtd->dai_link->ignore_pmdown_time) {
 			/* powered down playback stream now */
 			snd_soc_dapm_stream_event(rtd,