Handle more mem alloc issues found with failmalloc

Python/future.c

@@ -121,8 +121,10 @@ PyFuture_FromAST(mod_ty mod, const char *filename)
 	PyFutureFeatures *ff;
 
 	ff = (PyFutureFeatures *)PyObject_Malloc(sizeof(PyFutureFeatures));
-	if (ff == NULL)
+	if (ff == NULL) {
+		PyErr_NoMemory();
 		return NULL;
+	}
 	ff->ff_features = 0;
 	ff->ff_lineno = -1;
 

Python/symtable.c

@@ -529,6 +529,8 @@ update_symbols(PyObject *symbols, PyObject *scope,
 		i = PyInt_AS_LONG(w);
 		flags |= (i << SCOPE_OFF);
 		u = PyInt_FromLong(flags);
+		if (!u)
+			return 0;
 		if (PyDict_SetItem(symbols, name, u) < 0) {
 			Py_DECREF(u);
 			return 0;