Clean up prog_status
- If `waidpid` returns 0 or -1, we should return. - Make the fprintf message a bit clearer on what's happening when we have some kind of status that we didn't handle.
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- If `waidpid` returns 0 or -1, we should return. - Make the fprintf message a bit clearer on what's happening when we have some kind of status that we didn't handle.