exit(2) on unsupported positional arguments on command line

Change-Id: I4f2d70d0b0f1b7bdb8604c930aba8fbb53d8bd54

src/gb_proxy_main.c

@@ -196,6 +196,11 @@ static void handle_options(int argc, char **argv)
 			break;
 		}
 	}
+
+	if (argc > optind) {
+		fprintf(stderr, "Unsupported positional arguments on command line\n");
+		exit(2);
+	}
 }
 
 int gbproxy_vty_is_config_node(struct vty *vty, int node)