Merge pull request #2488 from bansiesta/fix_land_detector_start

land_detector: shut up if started correctly

src/modules/land_detector/land_detector_main.cpp

@@ -196,6 +196,7 @@ int land_detector_main(int argc, char *argv[])
 			warnx("land_detector start failed");
 			return 1;
 		}
+		return 0;
 	}
 
 	if (!strcmp(argv[1], "stop")) {