ASoC: core: Fix possible NULL pointer dereference of pcm->config
Since the soc generic dmaengine pcm driver allows using the defualt settings, so the pcm->config maybe NULL. Signed-off-by: NXiubo Li <Li.Xiubo@freescale.com> Acked-by: NLars-Peter Clausen <lars@metafoo.de> Signed-off-by: NMark Brown <broonie@linaro.org>
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