daemon(8): handle case of waitpid() returning without exited child

[kib]

Summary

Not checking for either WIFEXITED(status) or zero result results in never finishing the loop.

PR: 277764

[kevans]

Oh, return () style differs here

[tamelingdaniel_gmail.com]

usr.sbin/daemon/daemon.c

767

I think you also need to check WIFSIGNALED(status). Otherwise daemon will not finish when the child is killed by a signal.

[kib]

Check for WIFSIGNALLED.
Un-style return.