DNM Board was hanging in

src/drivers/magnetometer/hmc5883/hmc5883_main.cpp

@@ -101,6 +101,7 @@ void HMC5883::print_usage()
 
 extern "C" int hmc5883_main(int argc, char *argv[])
 {
+  return 0;
 	using ThisDriver = HMC5883;
 	int ch;
 	BusCLIArguments cli{true, true};

src/modules/dataman/dataman.cpp

@@ -1190,6 +1190,7 @@ static int backend_check()
 int
 dataman_main(int argc, char *argv[])
 {
+  return 0;
 	if (argc < 2) {
 		usage();
 		return -1;

src/modules/mavlink/mavlink_main.cpp

@@ -3395,6 +3395,7 @@ $ mavlink stream -u 14556 -s HIGHRES_IMU -r 50
 
 extern "C" __EXPORT int mavlink_main(int argc, char *argv[])
 {
+  return 0;
 	if (argc < 2) {
 		usage();
 		return 1;