Null-terminate lcd_status_message

Marlin/src/lcd/ultralcd.cpp

 inline void pad_message_string() {
   uint8_t i = 0, j = 0;
   char c;
+  lcd_status_message[MAX_MESSAGE_LENGTH] = '\0';
   while ((c = lcd_status_message[i]) && j < LCD_WIDTH) {
     if (PRINTABLE(c)) j++;
     i++;
 
 void lcd_setstatus(const char * const message, const bool persist) {
   if (lcd_status_message_level > 0) return;
-  strncpy(lcd_status_message, message, COUNT(lcd_status_message) - 1);
+  strncpy(lcd_status_message, message, MAX_MESSAGE_LENGTH);
   lcd_finishstatus(persist);
 }
 
   if (level < 0) level = lcd_status_message_level = 0;
   if (level < lcd_status_message_level) return;
   lcd_status_message_level = level;
-  strncpy_P(lcd_status_message, message, COUNT(lcd_status_message) - 1);
+  strncpy_P(lcd_status_message, message, MAX_MESSAGE_LENGTH);
   lcd_finishstatus(level > 0);
 }
 
   lcd_status_message_level = level;
   va_list args;
   va_start(args, fmt);
-  vsnprintf_P(lcd_status_message, COUNT(lcd_status_message) - 1, fmt, args);
+  vsnprintf_P(lcd_status_message, MAX_MESSAGE_LENGTH, fmt, args);
   va_end(args);
   lcd_finishstatus(level > 0);
 }