Check remaining args in tools/parse (#185)

Author: apstndb

tools/parse/main.go

@@ -51,7 +51,7 @@ func main() {
 	}
 
 	flag.Parse()
-	if flag.NArg() < 1 {
+	if flag.NArg() != 1 {
 		flag.Usage()
 		os.Exit(1)
 		return