AP_InertialNav: remove unused get_hgt_ctrl_limit

libraries/AP_InertialNav/AP_InertialNav.h

@@ -104,14 +104,6 @@ public:
      */
     virtual float       get_altitude() const = 0;
 
-    /**
-     * get_hgt_ctrl_limit - get maximum height to be observed by the control loops in cm and a validity flag
-     * this is used to limit height during optical flow navigation
-     * it will return invalid when no limiting is required
-     * @return
-     */
-    virtual bool       get_hgt_ctrl_limit(float& limit) const = 0;
-
     /**
      * get_velocity_z - returns the current climbrate.
      *

libraries/AP_InertialNav/AP_InertialNav_NavEKF.cpp

@@ -158,23 +158,6 @@ bool AP_InertialNav_NavEKF::get_hagl(float &height) const
     return valid;
 }
 
-/**
- * get_hgt_ctrl_limit - get maximum height to be observed by the control loops in cm and a validity flag
- * this is used to limit height during optical flow navigation
- * it will return invalid when no limiting is required
- * @return
- */
-bool AP_InertialNav_NavEKF::get_hgt_ctrl_limit(float& limit) const
-{
-    // true when estimate is valid
-    if (_ahrs_ekf.get_hgt_ctrl_limit(limit)) {
-        // convert height from m to cm
-        limit *= 100.0f;
-        return true;
-    }
-    return false;
-}
-
 /**
  * get_velocity_z - returns the current climbrate.
  *

libraries/AP_InertialNav/AP_InertialNav_NavEKF.h

@@ -94,14 +94,6 @@ public:
      */
     bool       get_hagl(float &hagl) const;
 
-    /**
-     * get_hgt_ctrl_limit - get maximum height to be observed by the control loops in cm and a validity flag
-     * this is used to limit height during optical flow navigation
-     * it will return invalid when no limiting is required
-     * @return
-     */
-    bool       get_hgt_ctrl_limit(float& limit) const;
-
     /**
      * get_velocity_z - returns the current climbrate.
      *