Merge "snapshotctl: Initialize snapshot pointer when reverting snapshots" into main am: 5a6ab7d8

Original change: https://android-review.googlesource.com/c/platform/system/core/+/3297000



Change-Id: I0ca0c741a5a5543f6b6d6a5d7183c71442b134da
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>