Merge "init: reset errno in do_start" into main am: 0508911496

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2720693

Change-Id: I85ae93eb5c013d766c4bcd5fee93376981f28882
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>