Merge "Nullability check for dirent module" am: e744d81787

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2496357

Change-Id: I01ea38359fd0dd59107705c00803f4e94d8de517
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>