Update eventbinder (#268)

Co-authored-by: Matthieu Dartiailh <m.dartiailh@gmail.com>

Author: frmdstryr

atom/src/eventbinder.cpp

@@ -36,10 +36,7 @@ EventBinder_traverse( EventBinder* self, visitproc visit, void* arg )
 {
     Py_VISIT( self->member );
     Py_VISIT( self->atom );
-#if PY_VERSION_HEX >= 0x03090000
-    // This was not needed before Python 3.9 (Python issue 35810 and 40217)
     Py_VISIT(Py_TYPE(self));
-#endif
     return 0;
 }
 
@@ -52,7 +49,11 @@ EventBinder_dealloc( EventBinder* self )
     if( numfree < FREELIST_MAX )
         freelist[ numfree++ ] = self;
     else
-        Py_TYPE(self)->tp_free( pyobject_cast( self ) );
+    {
+        PyTypeObject* tp = Py_TYPE( self );
+        tp->tp_free( pyobject_cast( self ) );
+        Py_DECREF( tp );
+    }
 }
 
 
@@ -168,6 +169,7 @@ EventBinder::New( Member* member, CAtom* atom )
     {
         pybinder = pyobject_cast( freelist[ --numfree ] );
         _Py_NewReference( pybinder );
+        PyObject_GC_Track( pybinder );
     }
     else
     {