Add a null pointer check for wifi_chip in am: 4e634924 am: 26b62570 am:...

Add a null pointer check for wifi_chip in am: 4e634924 am: 26b62570 am: 590248f6 am: 38b17aec am: 4d0c1a01 am: c5212efc

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2279026



Change-Id: If90218700cfaa72141ec6005150c9cdadf192341
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>