Merge "Nullability check for fts module" am: 5ae243b7f9

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2490968

Change-Id: I263a6ca54ba17f3cae5f6b419413949e275f4d13
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>