Check for ECHILD, not for "not ECHILD".

That makes the logic a bit clearer (and puts the "unexpected other
error" case at the end, where it should be).

Put all the errno checks inside an else clause, making it clearer that
it runs only if waitpid() returned -1.

Add comments, including comments explaining why just driving on after
getting EINTR should be OK.

Change-Id: Iaa1b151393fcec8b4f5bd560ef913a224400932b
Reviewed-on: https://code.wireshark.org/review/11951
Reviewed-by: Guy Harris <guy@alum.mit.edu>

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