qcacld-3.0: cmn_services: 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 cmn_services replace any such comparisons with
logical operations performed on the pointer itself.

Change-Id: I7141cd900916bd4bbab1bc8c7a1b90589286582b
CRs-Fixed: 2418402
2 files changed