Ddded cli check for ism330dlc startup to prevent hardfault if no options are given.

src/drivers/imu/st/ism330dlc/ism330dlc_main.cpp

@@ -132,6 +132,11 @@ extern "C" __EXPORT int ism330dlc_main(int argc, char *argv[])
 		}
 	}
 
+	if (myoptind >= argc) {
+		ism330dlc::usage();
+		return -1;
+	}
+
 	const char *verb = argv[myoptind];
 
 	if (!strcmp(verb, "start")) {