msm:ipa3: Fixed pointer dereference issue without checking for null

Checking of null is added before sending it to function.

Change-Id: I49e4c78394a790d8d8f3b2ebca56405c61a83543
Acked-by: Rishabh Garg <rishgarg@qti.qualcomm.com>
Signed-off-by: Pooja Kumari <kumarip@codeaurora.org>