ASoC: imx-pcm-dma: open function failed when snd_dmaengine_pcm_open fail

snd_imx_open should return error code returned by snd_dmaengine_pcm_open.
Signed-off-by: Richard Zhao <richard.zhao@freescale.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/fsl/imx-pcm-dma.c

@@ -120,7 +120,7 @@ static int snd_imx_open(struct snd_pcm_substream *substream)
 	ret = snd_dmaengine_pcm_open(substream, filter, dma_data);
 	if (ret) {
 		kfree(dma_data);
-		return 0;
+		return ret;
 	}
 
 	snd_dmaengine_pcm_set_data(substream, dma_data);