fix incorrect argc < 1 check for no arguments

-requiring arguments should be argc < 2

src/examples/fixedwing_control/main.c

@@ -418,7 +418,7 @@ usage(const char *reason)
  */
 int ex_fixedwing_control_main(int argc, char *argv[])
 {
-	if (argc < 1) {
+	if (argc < 2) {
 		usage("missing command");
 	}
 

src/examples/flow_position_estimator/flow_position_estimator_main.c

@@ -99,7 +99,7 @@ static void usage(const char *reason)
  */
 int flow_position_estimator_main(int argc, char *argv[])
 {
-	if (argc < 1) {
+	if (argc < 2) {
 		usage("missing command");
 	}
 

src/examples/matlab_csv_serial/matlab_csv_serial.c

@@ -91,7 +91,7 @@ static void usage(const char *reason)
  */
 int matlab_csv_serial_main(int argc, char *argv[])
 {
-	if (argc < 1) {
+	if (argc < 2) {
 		usage("missing command");
 	}
 

src/examples/publisher/publisher_start_nuttx.cpp

@@ -54,7 +54,7 @@ extern int main(int argc, char **argv);
 extern "C" __EXPORT int publisher_main(int argc, char *argv[]);
 int publisher_main(int argc, char *argv[])
 {
-	if (argc < 1) {
+	if (argc < 2) {
 		errx(1, "usage: publisher {start|stop|status}");
 	}
 

src/examples/px4_daemon_app/px4_daemon_app.c

@@ -88,7 +88,7 @@ usage(const char *reason)
  */
 int px4_daemon_app_main(int argc, char *argv[])
 {
-	if (argc < 1) {
+	if (argc < 2) {
 		usage("missing command");
 	}
 

src/examples/rover_steering_control/main.cpp

@@ -412,7 +412,7 @@ usage(const char *reason)
  */
 int rover_steering_control_main(int argc, char *argv[])
 {
-	if (argc < 1) {
+	if (argc < 2) {
 		usage("missing command");
 	}
 

src/examples/subscriber/subscriber_start_nuttx.cpp

@@ -54,7 +54,7 @@ extern int main(int argc, char **argv);
 extern "C" __EXPORT int subscriber_main(int argc, char *argv[]);
 int subscriber_main(int argc, char *argv[])
 {
-	if (argc < 1) {
+	if (argc < 2) {
 		errx(1, "usage: subscriber {start|stop|status}");
 	}