Support MAVLink usage in simulation

gazebo/SBUS.h

@@ -10,7 +10,6 @@ public:
 	SBUS(HardwareSerial& bus) {};
 	void begin() {};
 	bool read(int16_t* channels, bool* failsafe, bool* lostFrame) { // NOTE: on the hardware channels is uint16_t
-		joystickGet();
-		return true;
+		return joystickGet();
 	};
 };