init: don't report abandoned children

This is a fixup of "base: fix destruction of async env sessions".

repos/os/src/init/child.cc

@@ -317,6 +317,9 @@ void Init::Child::apply_downgrade()
 
 void Init::Child::report_state(Xml_generator &xml, Report_detail const &detail) const
 {
+	if (abandoned())
+		return;
+
 	/* true if it's safe to call the PD for requesting resource information */
 	bool const pd_alive = !abandoned() && !_exited;