Fix crash when continuing without a save device

saveLoadSlot() and uiSelectSaveNameEntered() both asserted
SAVE.deviceCurrent != 0xFF unconditionally, crashing as soon as a player
dismissed the "no save device found" prompt and tried to start a game or
name a new save. Both now fall back to an in-memory-only slot (no device
to persist to) instead of asserting, matching the "continue without a
save device" flow the main menu cutscene already offers.

Verified fixed on Dolphin/GameCube; built clean on Linux and GameCube
(Docker).

Co-Authored-By: Claude Sonnet 5 <[email protected]>

src/dusk/save/save.c

@@ -208,9 +208,15 @@ errorret_t saveSaveSlot() {
 }
 
 errorret_t saveLoadSlot() {
-  assertTrue(SAVE.deviceCurrent != 0xFF, "No current device");
   assertTrue(SAVE.slotCurrent < SAVE_SLOT_COUNT, "Invalid slot index");
 
+  if(SAVE.deviceCurrent == 0xFF) {
+    // No save device available, so we assume an empty slot.
+    saveSlotInit(&SAVE.slot);
+    SAVE.caches[SAVE.slotCurrent] = SAVE.slot.cachedData;
+    errorOk();
+  }
+
   errorChain(saveDeviceSlotRead(
     &SAVE.devices[SAVE.deviceCurrent],
     &SAVE.slot,

src/dusk/ui/dialog/save/uiselectsave.c

@@ -99,13 +99,16 @@ void uiSelectSaveNameEntered(
 ) {
   if(!confirmed) return;
 
-  assertTrue(SAVE.deviceCurrent != 0xFF, "No current device");
   const uint8_t index = UI_SELECT_SAVE.pendingNameIndex;
 
   saveslot_t slot;
   saveSlotInit(&slot);
   stringCopy(slot.cachedData.name, text, SAVE_SLOT_NAME_LENGTH);
 
+  // No save device available - proceed with an in-memory-only slot rather
+  // than writing to a device that doesn't exist (see saveLoadSlot()'s own
+  // comment on the same "continue without a save device" flow).
+  if(SAVE.deviceCurrent != 0xFF) {
     errorret_t writeResult = saveDeviceSlotWrite(
       &SAVE.devices[SAVE.deviceCurrent], &slot, index
     );
@@ -114,6 +117,7 @@ void uiSelectSaveNameEntered(
       uiFatalErrorOpen(writeResult.state->message);
       return;
     }
+  }
 
   SAVE.caches[index] = slot.cachedData;
   uiSelectSaveRefreshSlot(index);