tfmini: add argc check and fix argv index

src/drivers/distance_sensor/tfmini/tfmini.cpp

@@ -922,31 +922,32 @@ usage()
 int
 tfmini_main(int argc, char *argv[])
 {
-	// check for optional arguments
 	int ch;
 	uint8_t rotation = distance_sensor_s::ROTATION_DOWNWARD_FACING;
 	const char *device_path = "";
 	int myoptind = 1;
 	const char *myoptarg = nullptr;
 
-
 	while ((ch = px4_getopt(argc, argv, "R:d:", &myoptind, &myoptarg)) != EOF) {
 		switch (ch) {
 		case 'R':
 			rotation = (uint8_t)atoi(myoptarg);
-			PX4_INFO("Setting distance sensor orientation to %d", (int)rotation);
 			break;
 
 		case 'd':
 			device_path = myoptarg;
-			PX4_INFO("Using device path '%s'", device_path);
 			break;
 
 		default:
 			PX4_WARN("Unknown option!");
+			return -1;
 		}
 	}
 
+	if (myoptind >= argc) {
+		goto out_error;
+	}
+
 	/*
 	 * Start/load the driver.
 	 */
@@ -957,7 +958,7 @@ tfmini_main(int argc, char *argv[])
 		} else {
 			PX4_WARN("Please specify device path!");
 			tfmini::usage();
-			return PX4_ERROR;
+			return -1;
 		}
 	}
 
@@ -985,10 +986,11 @@ tfmini_main(int argc, char *argv[])
 	/*
 	 * Print driver information.
 	 */
-	if (!strcmp(argv[myoptind], "info") || !strcmp(argv[1], "status")) {
+	if (!strcmp(argv[myoptind], "info") || !strcmp(argv[myoptind], "status")) {
 		tfmini::info();
 	}
 
+out_error:
 	PX4_ERR("unrecognized command, try 'start', 'test', 'reset' or 'info'");
-	return PX4_ERROR;
+	return -1;
 }