[pygobject] pyg_flags_get_value_names: fix a leak

[Christoph Reiter <creiter src gnome org>]

commit 4829e279ad8f91186f64df199652abc9bd852536
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Wed Mar 14 12:31:28 2018 +0100

    pyg_flags_get_value_names: fix a leak
    
    PyList_Append() is transfer-none for the value

 gi/pygflags.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)
---
diff --git a/gi/pygflags.c b/gi/pygflags.c
index fa12341f..d286a986 100644
--- a/gi/pygflags.c
+++ b/gi/pygflags.c
@@ -431,9 +431,15 @@ pyg_flags_get_value_names(PyGFlags *self, void *closure)
   g_assert(G_IS_FLAGS_CLASS(flags_class));
 
   retval = PyList_New(0);
-  for (i = 0; i < flags_class->n_values; i++)
-      if ((PYGLIB_PyLong_AsUnsignedLong(self) & flags_class->values[i].value) == 
flags_class->values[i].value)
-         PyList_Append(retval, PYGLIB_PyUnicode_FromString(flags_class->values[i].value_name));
+  for (i = 0; i < flags_class->n_values; i++) {
+      PyObject *value_name;
+
+      if ((PYGLIB_PyLong_AsUnsignedLong (self) & flags_class->values[i].value) == 
flags_class->values[i].value) {
+        value_name = PYGLIB_PyUnicode_FromString (flags_class->values[i].value_name);
+        PyList_Append (retval, value_name);
+        Py_DECREF (value_name);
+      }
+  }
 
   g_type_class_unref(flags_class);