z_fade_factor defined but not used

[BillStruve]

Don't understand how to get rid of the compiler warning: `sketch\planner.cpp:560:25: warning: unused variable 'z_fade_factor' [-Wunused-variable] constexpr float z_fade_factor = 1.0;

In planner.cpp:
#if  PLANNER_LEVELING
  ---
    #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
    ---
    #else
        constexpr float z_fade_factor = 1.0;         <--line 560
    #endif 
  ---
#endif // PLANNER_LEVELING      

In my Configuration.h:
//#define MESH_BED_LEVELING    // Enable mesh bed leveling.
#if ENABLED(MESH_BED_LEVELING)
  ---
  #define ENABLE_LEVELING_FADE_HEIGHT
  ---
#endif

In Conditionals_post.h:
#if ENABLED(AUTO_BED_LEVELING_LINEAR) || ENABLED(AUTO_BED_LEVELING_BILINEAR)
  ---
  #define PLANNER_LEVELING      (HAS_ABL || ENABLED(MESH_BED_LEVELING))
  #define ABL_PLANAR (ENABLED(AUTO_BED_LEVELING_LINEAR) || ENABLED(AUTO_BED_LEVELING_3POINT))
  #define ABL_GRID   (ENABLED(AUTO_BED_LEVELING_LINEAR) || ENABLED(AUTO_BED_LEVELING_BILINEAR))
  #define HAS_ABL    (ABL_PLANAR || ABL_GRID)
  ---
#endif

In my Configuration.h:
#define AUTO_BED_LEVELING_LINEAR 

[Blue-Marlin]

Find the right place for a

#else
  UNUSED(z_fade_factor)
#endif

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