Fix null pointer crash in AIDL radio HAL VTS

Bug: 277531858
Test: atest VtsHalBroadcastradioAidlTargetTest
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:978de0a8a4968774e81e10e716a46bd9e1369479)
Merged-In: Icb67c27b9a747411a9bfbd48647e6e6046cf5e8d
Change-Id: Icb67c27b9a747411a9bfbd48647e6e6046cf5e8d
1 file changed