signature: Fix an old refcounting bug6.6

This bug was a long existing oversight since 2018-10-14 !
amends 2533dab013455bf94da2d4766e54abaf4d735e1e

This bug has been hiding undetected for a really long
time between innocent lines of code since version 5.15.
But now someone has finally uncovered it and it will
be brought to justice.
Actually, I should be ashamed of myself.

Thanks to Joris van Rantwijk for finding this glitch.

Change-Id: Id86db1caea8c18c3a2d4d1707c0101fe8aa3d6d8
Task-number: PYSIDE-795
Fixes: PYSIDE-2660
Pick-to: 6.5
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
(cherry picked from commit f89113e21645b5076d47b656140f0ceecf35fa09)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit 8b302d296a58cba9a43c93aca06fad4526a7d13e)

1 files changed, 1 insertions, 1 deletions

diff --git a/sources/shiboken6/libshiboken/signature/signature_extend.cpp b/sources/shiboken6/libshiboken/signature/signature_extend.cpp
index ca560d00f..7292f8216 100644
--- a/sources/shiboken6/libshiboken/signature/signature_extend.cpp
+++ b/sources/shiboken6/libshiboken/signature/signature_extend.cpp
@@ -77,7 +77,7 @@ PyObject *pyside_md_get___signature__(PyObject *ob_md, PyObject *modifier)
 {
     AutoDecRef func(name_key_to_func(ob_md));
     if (func.object() == Py_None)
-        return Py_None;
+        Py_RETURN_NONE;
     if (func.isNull())
         Py_FatalError("missing mapping in MethodDescriptor");
     return pyside_cf_get___signature__(func, modifier);