Tweak MMU beeps, misc. cleanup

Marlin/src/feature/mmu2/mmu2.cpp

 
       if (move_axes && all_axes_homed()) {
         LCD_MESSAGEPGM(MSG_MMU2_RESUMING);
-        BUZZ(200, 404);
-        BUZZ(200, 404);
+        BUZZ(198, 404); BUZZ(4, 0); BUZZ(198, 404);
 
         // Move XY to starting position, then Z
         do_blocking_move_to_xy(resume_position, feedRate_t(NOZZLE_PARK_XY_FEEDRATE));
         do_blocking_move_to_z(resume_position.z, feedRate_t(NOZZLE_PARK_Z_FEEDRATE));
       }
       else {
-        BUZZ(200, 404);
-        BUZZ(200, 404);
+        BUZZ(198, 404); BUZZ(4, 0); BUZZ(198, 404);
         LCD_MESSAGEPGM(MSG_MMU2_RESUMING);
       }
     }

Marlin/src/gcode/config/M302.cpp

  *
  *       M302         ; report current cold extrusion state
  *       M302 P0      ; enable cold extrusion checking
- *       M302 P1      ; disables cold extrusion checking
+ *       M302 P1      ; disable cold extrusion checking
  *       M302 S0      ; always allow extrusion (disables checking)
  *       M302 S170    ; only allow extrusion above 170
  *       M302 S170 P1 ; set min extrude temp to 170 but leave disabled

Marlin/src/gcode/sd/M24_M25.cpp

 
     print_job_timer.pause();
 
-    TERN(DWIN_CREALITY_LCD,,ui.reset_status());
+    #if DISABLED(DWIN_CREALITY_LCD)
+      ui.reset_status();
+    #endif
 
     #if ENABLED(HOST_ACTION_COMMANDS)
       TERN_(HOST_PROMPT_SUPPORT, host_prompt_open(PROMPT_PAUSE_RESUME, PSTR("Pause SD"), PSTR("Resume")));

Marlin/src/lcd/dwin/e3v2/dwin.cpp

 
   // Copy into filebuf string before entry
   char * const name = card.longest_filename();
-  const int8_t npos = _MAX(0, DWIN_WIDTH - strlen(name) * MENU_CHR_W) / 2;
+  const int8_t npos = _MAX(0U, DWIN_WIDTH - strlen(name) * MENU_CHR_W) / 2;
   DWIN_Draw_String(false, false, font8x16, Color_White, Color_Bg_Black, npos, 60, name);
 
   DWIN_ICON_Show(ICON, ICON_PrintTime, 17, 193);
   inline void Draw_SDItem_Shifted(int8_t &shift) {
     // Limit to the number of chars past the cutoff
     const size_t len = strlen(shift_name);
-    NOMORE(shift, _MAX((signed)len - MENU_CHAR_LIMIT, 0));
+    NOMORE(shift, _MAX(len - MENU_CHAR_LIMIT, 0U));
 
     // Shorten to the available space
     const size_t lastchar = _MIN((signed)len, shift + MENU_CHAR_LIMIT);

Marlin/src/sd/cardreader.cpp

   #include "../feature/pause.h"
 #endif
 
-#define DEBUG_OUT ENABLED(DEBUG_CARDREADER)
+#define DEBUG_OUT EITHER(DEBUG_CARDREADER, MARLIN_DEV_MODE)
 #include "../core/debug_out.h"
 
 // public:
   cdroot();
 }
 
-void CardReader::closefile(const bool store_location) {
+void CardReader::closefile(const bool store_location/*=false*/) {
   file.sync();
   file.close();
   flag.saving = flag.logging = false;