spicenum.c: fix memory leak completely

src/frontend/numparam/spicenum.c

@@ -487,6 +487,9 @@ nupa_del_dicoS(void)
 
     dispose(dicoS->dynrefptr);
     dispose(dicoS->dyncategory);
+    dispose(dicoS->inst_name);
+    dispose(dicoS->local_symbols);
+    nghash_free(dicoS->global_symbols, NULL, NULL);
     dispose(dicoS);
     dicoS = NULL;
 }