uavcan: don't init ESC if UAVCAN_ENABLE isn't set for ESC

src/drivers/uavcan/actuators/esc.cpp

@@ -81,6 +81,8 @@ UavcanEscController::init()
 		_param_handles[i] = param_find(param_name);
 	}
 
+	_initialized = true;
+
 	return res;
 }
 

src/drivers/uavcan/actuators/esc.hpp

@@ -69,6 +69,8 @@ public:
 
 	int init();
 
+	bool initialized() { return _initialized; };
+
 	void update_outputs(uint16_t outputs[MAX_ACTUATORS], unsigned total_outputs);
 
 	/**
@@ -97,6 +99,8 @@ private:
 	typedef uavcan::MethodBinder<UavcanEscController *,
 		void (UavcanEscController::*)(const uavcan::TimerEvent &)> TimerCbBinder;
 
+	bool _initialized{};
+
 	esc_status_s	_esc_status{};
 
 	uORB::PublicationMulti<esc_status_s> _esc_status_pub{ORB_ID(esc_status)};