Clean Endstops::event_handler

Marlin/src/module/endstops.cpp

 
 void Endstops::event_handler() {
   static uint8_t prev_hit_state; // = 0
-  if (hit_state && hit_state != prev_hit_state) {
+  if (hit_state == prev_hit_state) return;
+  prev_hit_state = hit_state;
+  if (hit_state) {
     #if HAS_SPI_LCD
       char chrX = ' ', chrY = ' ', chrZ = ' ', chrP = ' ';
       #define _SET_STOP_CHAR(A,C) (chr## A = C)
       }
     #endif
   }
-  prev_hit_state = hit_state;
 }
 
 static void print_es_state(const bool is_hit, PGM_P const label=nullptr) {