call px4_open instead of open

src/modules/commander/commander.cpp

@@ -933,7 +933,7 @@ int commander_thread_main(int argc, char *argv[])
 		mavlink_and_console_log_critical(mavlink_fd, "ERROR: BATTERY INIT FAIL");
 	}
 
-	mavlink_fd = open(MAVLINK_LOG_DEVICE, 0);
+	mavlink_fd = px4_open(MAVLINK_LOG_DEVICE, 0);
 
 	/* vehicle status topic */
 	memset(&status, 0, sizeof(status));