detach(): warn if we see ECHILD from waitpid

* strace.c (detach): Warn if we see ECHILD from waitpid.
Explain in comments that we don't normally expect !WIFSTOPPED
either, and also that PTRACE_CONT failure isn't expected
(the "break" there is a "I'm confused, bailing out" code style)..

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
1 file changed