bpo-31787: Prevent refleaks when calling __init__() more than once (GH-3995)

(cherry picked from commit d019bc8319ea35e93bf4baa38098ff1b57cd3ee5)

Co-authored-by: Oren Milman <orenmn@gmail.com>
diff --git a/Objects/descrobject.c b/Objects/descrobject.c
index a253018..6014039 100644
--- a/Objects/descrobject.c
+++ b/Objects/descrobject.c
@@ -1490,10 +1490,10 @@
     Py_XINCREF(fdel);
     Py_XINCREF(doc);
 
-    self->prop_get = fget;
-    self->prop_set = fset;
-    self->prop_del = fdel;
-    self->prop_doc = doc;
+    Py_XSETREF(self->prop_get, fget);
+    Py_XSETREF(self->prop_set, fset);
+    Py_XSETREF(self->prop_del, fdel);
+    Py_XSETREF(self->prop_doc, doc);
     self->getter_doc = 0;
 
     /* if no docstring given and the getter has one, use that one */