Update return statements

Use blank returns for subroutines.

src/packages/game/data/IZ_list.c

@@ -93,7 +93,7 @@ void IZ_ListTeardown(IZ_List* list) {
  * @return Pointer to the newly created node.
  */
 void IZ_ListAppendNode(IZ_List* list, void* node_value, IZ_ListNode** new_node) {
-	return IZ_ListDoAppendNode(list, node_value, new_node);
+	IZ_ListDoAppendNode(list, node_value, new_node);
 }
 
 /**
@@ -173,7 +173,8 @@ void IZ_ListInsertNodeAtIndex(IZ_List* list, void* node_value, u64 dest_index, I
 	}
 
 	if (dest_index == list->length) {
-		return IZ_ListDoAppendNode(list, node_value, new_node_ref);
+		IZ_ListDoAppendNode(list, node_value, new_node_ref);
+		return;
 	}
 
 	IZ_ListNode* new_node = IZ_malloc(sizeof(IZ_ListNode));