Merge "Call sync() to guarantee blocks were released by unlink" into main am: 2d4d60cc

Original change: https://android-review.googlesource.com/c/platform/system/core/+/3150956



Change-Id: I69f9b8474033c14b5a2a28ed3f3c0758dab9c2a9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>