Fix compile warnings, serial alias

Marlin/src/lcd/dogm/status_screen_DOGM.cpp

@@ -774,9 +774,15 @@ void MarlinUI::draw_status_screen() {
             mixer.update_mix_from_vtool();
             mix_label = PSTR("Mx");
           }
+
+        #pragma GCC diagnostic push
+        #pragma GCC diagnostic ignored "-Wformat-overflow"
+
         sprintf_P(mixer_messages, PSTR(S_FMT " %d;%d%% "), mix_label, int(mixer.mix[0]), int(mixer.mix[1]));
         lcd_put_u8str(X_LABEL_POS, XYZ_BASELINE, mixer_messages);
 
+        #pragma GCC diagnostic pop
+
       #else
 
         if (show_e_total) {