Fix EEPROM error with EXTRUDERS == 0 (#16464)

Marlin/src/module/configuration_store.cpp

@@ -1145,7 +1145,7 @@ void MarlinSettings::postprocess() {
         EEPROM_WRITE(planner.extruder_advance_K);
       #else
         dummy = 0;
-        for (uint8_t q = EXTRUDERS; q--;) EEPROM_WRITE(dummy);
+        for (uint8_t q = MIN(EXTRUDERS, 1); q--;) EEPROM_WRITE(dummy);
       #endif
     }
 
@@ -1934,7 +1934,7 @@ void MarlinSettings::postprocess() {
       // Linear Advance
       //
       {
-        float extruder_advance_K[EXTRUDERS];
+        float extruder_advance_K[MIN(EXTRUDERS, 1)];
         _FIELD_TEST(planner_extruder_advance_K);
         EEPROM_READ(extruder_advance_K);
         #if ENABLED(LIN_ADVANCE)