Merge "Revert "libprocessgroup: return false on failure"" am: a2b180ab am:...

Merge "Revert "libprocessgroup: return false on failure"" am: a2b180ab am: cfad863a am: 580548b4 am: 53bfab91 am: cdb0aa18

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2061121



Change-Id: I767019c249d034653ad608ec15c93182310a4f13
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>