mavlink: remove _log_enabled flag

It's obsolete since we removed the mavlink log file

src/modules/mavlink/mavlink_main.cpp

@@ -250,7 +250,6 @@ Mavlink::Mavlink() :
 	_message_buffer_mutex {},
 	_send_mutex {},
 	_param_initialized(false),
-	_logging_enabled(false),
 	_broadcast_mode(Mavlink::BROADCAST_MODE_OFF),
 	_param_system_id(PARAM_INVALID),
 	_param_component_id(PARAM_INVALID),

src/modules/mavlink/mavlink_main.h

@@ -418,13 +418,6 @@ public:
 
 	bool			accepting_commands() { return true; /* non-trivial side effects ((!_config_link_on) || (_mode == MAVLINK_MODE_CONFIG));*/ }
 
-	/**
-	 * Whether or not the system should be logging
-	 */
-	bool			get_logging_enabled() { return _logging_enabled; }
-
-	void			set_logging_enabled(bool logging) { _logging_enabled = logging; }
-
 	int				get_data_rate() { return _datarate; }
 	void			set_data_rate(int rate) { if (rate > 0) { _datarate = rate; } }
 
@@ -561,7 +554,6 @@ private:
 	pthread_mutex_t		_send_mutex;
 
 	bool			_param_initialized;
-	bool			_logging_enabled;
 	uint32_t		_broadcast_mode;
 
 	param_t			_param_system_id;

src/modules/mavlink/mavlink_messages.cpp

@@ -534,15 +534,6 @@ protected:
 		const bool updated_cpuload = _cpuload_sub->update(&cpuload);
 		const bool updated_battery = _battery_status_sub->update(&battery_status);
 
-		if (updated_status) {
-			if (status.arming_state >= vehicle_status_s::ARMING_STATE_ARMED) {
-				_mavlink->set_logging_enabled(true);
-
-			} else {
-				_mavlink->set_logging_enabled(false);
-			}
-		}
-
 		if (updated_status || updated_battery || updated_cpuload) {
 			mavlink_sys_status_t msg = {};