libprocessgroup: Add a function to remove only empty process groups
When system_server and zygote crash or get killed, all apps also get
killed but their process groups are left empty. Provide a function to
remove all empty process groups so that init can purge them when this
even happens.
Bug: 228160715
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: Ife38ca021e80cd38106f218ae13183e8c2631bf0
Merged-In: Ife38ca021e80cd38106f218ae13183e8c2631bf0
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