Copter: remove unused scaleLongDown member

ArduCopter/Copter.cpp

@@ -27,7 +27,6 @@ Copter::Copter(void)
     : logger(g.log_bitmask),
     flight_modes(&g.flight_mode1),
     control_mode(STABILIZE),
-    scaleLongDown(1),
     simple_cos_yaw(1.0f),
     super_simple_cos_yaw(1.0),
     land_accel_ef_filter(LAND_DETECTOR_ACCEL_LPF_CUTOFF),

ArduCopter/Copter.h

@@ -386,10 +386,6 @@ private:
     MOTOR_CLASS *motors;
     const struct AP_Param::GroupInfo *motors_var_info;
 
-    // GPS variables
-    // Sometimes we need to remove the scaling for distance calcs
-    float scaleLongDown;
-
     int32_t _home_bearing;
     uint32_t _home_distance;
 

ArduCopter/commands.cpp

@@ -78,8 +78,6 @@ bool Copter::set_home(const Location& loc, bool lock)
 
     // init inav and compass declination
     if (!home_was_set) {
-        // update navigation scalers.  used to offset the shrinking longitude as we go towards the poles
-        scaleLongDown = longitude_scale(loc);
         // record home is set
         Log_Write_Event(DATA_SET_HOME);