px4_simple_app: update printf to latest format version

src/examples/px4_simple_app/px4_simple_app.c

 /****************************************************************************
  *
- *   Copyright (c) 2012-2015 PX4 Development Team. All rights reserved.
+ *   Copyright (c) 2012-2016 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -58,7 +58,8 @@ int px4_simple_app_main(int argc, char *argv[])
 
 	/* subscribe to sensor_combined topic */
 	int sensor_sub_fd = orb_subscribe(ORB_ID(sensor_combined));
-	orb_set_interval(sensor_sub_fd, 1000);
+	/* limit the update rate to 5 Hz */
+	orb_set_interval(sensor_sub_fd, 200);
 
 	/* advertise attitude topic */
 	struct vehicle_attitude_s att;
@@ -82,14 +83,13 @@ int px4_simple_app_main(int argc, char *argv[])
 		/* handle the poll result */
 		if (poll_ret == 0) {
 			/* this means none of our providers is giving us data */
-			PX4_ERR("[px4_simple_app] Got no data within a second");
+			PX4_ERR("Got no data within a second");
 
 		} else if (poll_ret < 0) {
 			/* this is seriously bad - should be an emergency */
 			if (error_counter < 10 || error_counter % 50 == 0) {
 				/* use a counter to prevent flooding (and slowing us down) */
-				PX4_ERR("[px4_simple_app] ERROR return value from poll(): %d"
-					, poll_ret);
+				PX4_ERR("ERROR return value from poll(): %d", poll_ret);
 			}
 
 			error_counter++;
@@ -101,7 +101,7 @@ int px4_simple_app_main(int argc, char *argv[])
 				struct sensor_combined_s raw;
 				/* copy sensors raw data into local buffer */
 				orb_copy(ORB_ID(sensor_combined), sensor_sub_fd, &raw);
-				PX4_WARN("[px4_simple_app] Accelerometer:\t%8.4f\t%8.4f\t%8.4f",
+				PX4_INFO("Accelerometer:\t%8.4f\t%8.4f\t%8.4f",
 					 (double)raw.accelerometer_m_s2[0],
 					 (double)raw.accelerometer_m_s2[1],
 					 (double)raw.accelerometer_m_s2[2]);