[3.11] bpo-31718: Fix io.IncrementalNewlineDecoder SystemErrors and s…

…egfaults (pythonGH-18640)

Co-authored-by: Oren Milman <orenmn@gmail.com>
Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>.
(cherry picked from commit 53eef27)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>

Modules/_io/textio.c

@@ -238,7 +238,6 @@ _io_IncrementalNewlineDecoder___init___impl(nldecoder_object *self,
     else {
         errors = Py_NewRef(errors);
     }
-    Py_INCREF(self->errors);
 
     Py_XSETREF(self->errors, errors);
     Py_XSETREF(self->decoder, Py_NewRef(decoder));