fw_att_ctrl: remove unused variable

src/modules/fw_att_control/ecl_pitch_controller.h

@@ -80,14 +80,8 @@ public:
 		_bodyrate_setpoint = math::constrain(rate, -_max_rate_neg, _max_rate);
 	}
 
-	void set_roll_ff(float roll_ff)
-	{
-		_roll_ff = roll_ff;
-	}
-
 protected:
 	float _max_rate_neg{0.0f};
-	float _roll_ff{0.0f};
 };
 
 #endif // ECL_PITCH_CONTROLLER_H