[pygobject] pygobject_register_version_tuples: fix a leak

[Christoph Reiter <creiter src gnome org>]

commit 507e6a2824b5bde57e43c56c3178b5dac57506a1
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Thu Mar 22 20:23:10 2018 +0100

    pygobject_register_version_tuples: fix a leak

 gi/gimodule.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gi/gimodule.c b/gi/gimodule.c
index dcdc89dd..ca52dad4 100644
--- a/gi/gimodule.c
+++ b/gi/gimodule.c
@@ -2373,6 +2373,7 @@ pygobject_register_version_tuples(PyObject *d)
                           PYGOBJECT_MINOR_VERSION,
                           PYGOBJECT_MICRO_VERSION);
     PyDict_SetItemString(d, "pygobject_version", tuple);
+    Py_DECREF (tuple);
 }
 
 PYGLIB_MODULE_START(_gi, "_gi")