Udev may close child processes when a process associated with a rule
(/etc/udev/rules) terminates. As mac spoofing notifications processes are launched in background, with a static wait, they may be killed before the message is effectively displayed. This patch makes tails-spoof-mac wait for those processes before exiting. It may makes tails-spoof-mac wait indefinitely. However, udev will ensure it terminates after 120 seconds.
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