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

Change-Id: I436bb3ec12d331df2260507b6a9afbab84a8a54f
CRs-Fixed: 2418256
6 files changed