asoc: add missing null check for pcm pointer of snd_pcm_volume
In platform driver volume controls, add null check for
pcm pointer of struct snd_pcm_volume.
Change-Id: I6e95a62c7b71b6586a23edd8039df3c3c300fe2c
Signed-off-by: xsang <xsang@codeaurora.org>
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