ASoC: msm: qdsp6: set pointer to NULL after free.

Pointer after kfree is not sanitized.
Set pointer to NULL.

Backport reference:
 * CRs-Fixed: 2008031
 * Change-Id: Ia59a57fcd142a6ed18d168992b8da4019314afa4

Change-Id: I765a59a2059ba7a0fc16f70a1a8b92f57297a907
Signed-off-by: Xiaojun Sang <xsang@codeaurora.org>
Signed-off-by: Bikshapathi Kothapeta <bkotha@codeaurora.org>
Signed-off-by: Adrian DC <radian.dc@gmail.com>
4 files changed