Merge "Nullability check for dirent module" am: e744d81787 am: fafde23fc8

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

Change-Id: I3f2aa3b4817adf33262242a56341bc3639557ce2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>