gh-122081: fixed crash in decimal.IEEEContext() (#122082)

* gh-122081: fixed crash in decimal.IEEEContext()

Now

$ ./configure CFLAGS=-DEXTRA_FUNCTIONALITY -q && make -s && \
     ./python -m test test_decimal

- PASS

* Apply suggestions from code review

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>

* Update Misc/NEWS.d/next/Library/2024-07-21-10-45-24.gh-issue-122081.dNrYMq.rst

* Apply suggestions from code review

---------

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
Co-authored-by: Kumar Aditya <kumaraditya@python.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/Modules/_decimal/_decimal.c b/Modules/_decimal/_decimal.c
index 94a2cc2..15855e2 100644
--- a/Modules/_decimal/_decimal.c
+++ b/Modules/_decimal/_decimal.c
@@ -1519,7 +1519,7 @@ init_extended_context(PyObject *v)
 #ifdef EXTRA_FUNCTIONALITY
 /* Factory function for creating IEEE interchange format contexts */
 static PyObject *
-ieee_context(PyObject *dummy UNUSED, PyObject *v)
+ieee_context(PyObject *module, PyObject *v)
 {
     PyObject *context;
     mpd_ssize_t bits;
@@ -1536,7 +1536,7 @@ ieee_context(PyObject *dummy UNUSED, PyObject *v)
         goto error;
     }
 
-    decimal_state *state = get_module_state_by_def(Py_TYPE(v));
+    decimal_state *state = get_module_state(module);
     context = PyObject_CallObject((PyObject *)state->PyDecContext_Type, NULL);
     if (context == NULL) {
         return NULL;