Fix -Wnullable-to-nonnull-conversion error

Fix the build errors like https://android-build.googleplex.com/builds/pending/P56005836/aosp_arm64-userdebug/latest/view/logs/build.log

Bugs: b/245972273
Test: mm -j
Change-Id: I8edeace5afddc2cf6783899c889a3f2a542156a3
1 file changed