revid-cli: dealing with errors in revid-cli from start and stop if they occur

cmd/revid-cli/main.go

@@ -343,21 +343,28 @@ func startRevid(ns *netsender.Sender, cfg revid.Config) (*revid.Revid, revid.Con
 	if err != nil {
 		return nil, cfg, err
 	}
-	rv.Start()
-	return rv, cfg, nil
+	err = rv.Start()
+	return rv, cfg, err
 }
 
-func stopRevid(rv *revid.Revid) {
-	rv.Stop()
+func stopRevid(rv *revid.Revid) error {
+	err := rv.Stop()
+	if err != nil {
+		return err
+	}
 
 	// FIXME(kortschak): Is this waiting on completion of work?
 	// Use a wait group and Wait method if it is.
 	time.Sleep(revidStopTime)
+	return nil
 }
 
 func updateRevid(ns *netsender.Sender, rv *revid.Revid, cfg revid.Config, vars map[string]string, stop bool) (*revid.Revid, revid.Config, error) {
 	if stop {
-		stopRevid(rv)
+		err := stopRevid(rv)
+		if err != nil {
+			return nil, cfg, err
+		}
 	}
 
 	//look through the vars and update revid where needed