Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

wait: Do not copyout uninitialized status/rusage/wrusage.

If wait4() or wait6() return 0 because of WNOHANG, the status, rusage and
wrusage information should not be returned.

PR: 212048
Reported by: Casey Lucas
MFC after: 2 weeks