qcacld-3.0: pmo: Replace explicit comparison to NULL

Per the Linux Kernel coding style, as enforced by the kernel
checkpatch script, pointers should not be explicitly compared to
NULL. Therefore within pmo replace any such comparisons with logical
operations performed on the pointer itself.

Change-Id: I3697ede27e074252017e31be23caa93fc25885c5
CRs-Fixed: 2418398
4 files changed