[automerger skipped] libprocessgroup: Prevent error spam when tests disable...

[automerger skipped] libprocessgroup: Prevent error spam when tests disable all cpus in a cpuset am: ea98b60b -s ours

am skip reason: Merged-In Ia91d8839d86787569c255481bde077be51c43d93 with SHA-1 ae42d601 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/core/+/17061321

Change-Id: I120f08efcdad267864a91e4e758efed88d766ab6