Merge "Nullability check for resolv module" am: 1cccc1a059

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2468121

Change-Id: I7feeefe8a5c418a978a59a9df8da7c7a4e6cf2e6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>