udevadm-*.c: return != 0, if unknown option given

udev/udevadm-info.c

@@ -454,6 +454,7 @@ int udevadm_info(struct udev *udev, int argc, char *argv[])
 			       "  --help\n\n");
 			goto exit;
 		default:
+			rc = 1;
 			goto exit;
 		}
 	}

udev/udevadm-monitor.c

@@ -138,6 +138,9 @@ int udevadm_monitor(struct udev *udev, int argc, char *argv[])
 			       "  --help\n\n");
 			goto out;
 		}
+		default:
+			rc = 1;
+			goto out;
 	}
 
 	if (!print_kernel && !print_udev) {

udev/udevadm-trigger.c

@@ -199,6 +199,7 @@ int udevadm_trigger(struct udev *udev, int argc, char *argv[])
 			       "  --help\n\n");
 			goto exit;
 		default:
+			rc = 1;
 			goto exit;
 		}
 	}