bug#43358: stale processes left by mml-sec-tests

[Glenn Morris]

Package: emacs
Severity: minor
Version: 28.0.50

After running make check, I have stale processes left behind:

1567116 ?         1-03:09:09 core_s  0.0 S gpg-agent --homedir 
/tmp/emacs/test/data/mml-sec --use-standard-socket --daemon
1567374 ?         1-03:09:05 core_s  0.0 S scdaemon --multi-server --homedir 
/tmp/emacs/test/data/mml-sec

It would be nice if the tests could clean up processes when they finish.