Clean up comments, USB flash, NULLs

Marlin/src/lcd/TFTGLCD/marlinui_TFTGLCD.cpp

@@ -863,7 +863,7 @@ void MarlinUI::draw_status_screen() {
     lcd.setCursor(0, MIDDLE_Y);
     lcd.write(COLOR_EDIT);
     lcd_put_u8str_P(pstr);
-    if (value != nullptr) {
+    if (value) {
       lcd.write(':');
       lcd.setCursor((LCD_WIDTH - 1) - (utf8_strlen(value) + 1), MIDDLE_Y);  // Right-justified, padded by spaces
       lcd.write(' ');     // Overwrite char if value gets shorter