General code cleanup

Marlin/src/gcode/feature/advance/M900.cpp

     }
   #endif
 
-  float &kref = planner.extruder_advance_K[tool_index];
+  float &kref = planner.extruder_advance_K[tool_index], newK = kref;
+  const float oldK = newK;
 
   #if ENABLED(EXTRA_LIN_ADVANCE_K)
-    float &lref = other_extruder_advance_K[tool_index];
-  #endif
-
-  const float oldK = kref;
-  float newK = oldK;
 
-  #if ENABLED(EXTRA_LIN_ADVANCE_K)
+    float &lref = other_extruder_advance_K[tool_index];
 
     const bool old_slot = TEST(lin_adv_slot, tool_index), // The tool's current slot (0 or 1)
                new_slot = parser.boolval('S', old_slot);  // The passed slot (default = current)

Marlin/src/lcd/ultralcd.cpp

         }
       #endif
 
-      #if HAS_SHIFT_ENCODER      
+      #if HAS_SHIFT_ENCODER
         /**
          * Set up Rotary Encoder bit values (for two pin encoders to indicate movement).
          * These values are independent of which pins are used for EN_A / EN_B indications.

buildroot/share/tests/mega2560-tests

            BACKLASH_COMPENSATION BACKLASH_GCODE BAUD_RATE_GCODE BEZIER_CURVE_SUPPORT \
            FWRETRACT ARC_P_CIRCLES CNC_WORKSPACE_PLANES CNC_COORDINATE_SYSTEMS \
            PSU_CONTROL AUTO_POWER_CONTROL POWER_LOSS_RECOVERY POWER_LOSS_PIN POWER_LOSS_STATE \
-          SLOW_PWM_HEATERS THERMAL_PROTECTION_CHAMBER LIN_ADVANCE EXTRA_LIN_ADVANCE_K \
+           SLOW_PWM_HEATERS THERMAL_PROTECTION_CHAMBER LIN_ADVANCE EXTRA_LIN_ADVANCE_K \
            HOST_ACTION_COMMANDS HOST_PROMPT_SUPPORT PINS_DEBUGGING MAX7219_DEBUG M114_DETAIL
 exec_test $1 $2 "RAMPS | EXTRUDERS 2 | CHAR LCD + SD | FIX Probe | ABL-Linear | Advanced Pause | PLR | LEDs ..."