Remove temporary variables in SpawnRock

Source/items.cpp

@@ -1623,21 +1623,22 @@ void SpawnRock()
 	if (ActiveItemCount >= MAXITEMS)
 		return;
 
-	int oi;
-	bool ostand = false;
-	for (int i = 0; i < ActiveObjectCount && !ostand; i++) {
-		oi = ActiveObjects[i];
-		ostand = Objects[oi]._otype == OBJ_STAND;
+	Object *stand = nullptr;
+	for (int i = 0; i < ActiveObjectCount; i++) {
+		if (Objects[ActiveObjects[i]]._otype == OBJ_STAND) {
+			stand = &Objects[ActiveObjects[i]];
+			break;
+		}
 	}
 
-	if (!ostand)
+	if (stand == nullptr)
 		return;
 
 	int ii = AllocateItem();
 	auto &item = Items[ii];
 
-	item.position = Objects[oi].position;
-	dItem[Objects[oi].position.x][Objects[oi].position.y] = ii + 1;
+	item.position = stand->position;
+	dItem[item.position.x][item.position.y] = ii + 1;
 	int curlv = ItemsGetCurrlevel();
 	GetItemAttrs(item, IDI_ROCK, curlv);
 	SetupItem(item);