qcacmn: scan: 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 umac scan replace any such comparisons with
logical operations performed on the pointer itself.

Change-Id: I0127e39fb4278e9c8063e2b37e7b46a9311defe7
CRs-Fixed: 2420153
5 files changed