ASoC: pcm: add null check for be_substream
be_substream returns from snd_soc_dpcm_get_substream could be
NULL and add NULL check for be_substream.
Change-Id: I187bd6f22317cdbd6c6def3ee5b0afd3190fa810
Signed-off-by:
Meng Wang <mengw@codeaurora.org>
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