Fix ftbfs on Fedora 34

Signed-off-by: François Andriot <francois.andriot@free.fr>
(cherry picked from commit a2db78986d)

sip/tdeparts/browserextension.sip

@@ -477,7 +477,7 @@ TQMap<TQCString,int>   testTQMapTQCStringInt (TQMap<TQCString,int>);
         PyObject *ainst;
         PyObject *binst = NULL;
         if (((ainst = sipConvertFromNewType(new TQCString (acpp), sipType_TQCString, NULL)) == NULL)
-            || ((binst = PyInt_FromLong (bcpp)) < 0)
+            || ((binst = PyInt_FromLong (bcpp)) == NULL)
             || (PyDict_SetItem (dict, ainst, binst) < 0))
         {
             Py_XDECREF (ainst);