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: NRichard Zhao <richard.zhao@freescale.com> Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
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