Added return of node_init

exercises/03/vslc/include/ir.h

@@ -10,8 +10,16 @@ typedef struct n {
     struct n **children;
 } node_t;
 
-// Export the initializer function, it is needed by the parser
-void node_init (
+/**Export the initializer function, it is needed by the parser
+ * @param *nd node to initialize
+ * @param type type of node (see nodetype.h)
+ * @param *data associated data. Declared void to allow any type
+ * @param n_children number of children
+ * @param ... variable argument list of child nodes (node_t *)
+ * 
+ * @return Pointer to the initialized node
+ * */
+node_t* node_init (
     node_t *nd, node_index_t type, void *data, uint64_t n_children, ...
 );
 #endif