MAVLink app: Fix usage of static struct, make streams list const

src/modules/mavlink/mavlink_messages.cpp

@@ -2231,7 +2231,7 @@ protected:
 };
 
 
-StreamListItem *streams_list[] = {
+const StreamListItem *streams_list[] = {
 	new StreamListItem(&MavlinkStreamHeartbeat::new_instance, &MavlinkStreamHeartbeat::get_name_static),
 	new StreamListItem(&MavlinkStreamStatustext::new_instance, &MavlinkStreamStatustext::get_name_static),
 	new StreamListItem(&MavlinkStreamCommandLong::new_instance, &MavlinkStreamCommandLong::get_name_static),

src/modules/mavlink/mavlink_messages.h

@@ -56,6 +56,6 @@ public:
 	~StreamListItem() {};
 };
 
-extern StreamListItem *streams_list[];
+extern const StreamListItem *streams_list[];
 
 #endif /* MAVLINK_MESSAGES_H_ */

src/modules/mavlink/mavlink_receiver.cpp

@@ -822,7 +822,7 @@ MavlinkReceiver::handle_message_set_attitude_target(mavlink_message_t *msg)
 
 				/* Publish attitude setpoint if attitude and thrust ignore bits are not set */
 				if (!(_offboard_control_mode.ignore_attitude)) {
-					static struct vehicle_attitude_setpoint_s att_sp = {};
+					struct vehicle_attitude_setpoint_s att_sp = {};
 					att_sp.timestamp = hrt_absolute_time();
 					mavlink_quaternion_to_euler(set_attitude_target.q,
 							&att_sp.roll_body, &att_sp.pitch_body, &att_sp.yaw_body);