Address review:

* cleanup: forgotten PyLongWriter_Discard, pylong variable
* clarify news

Author: skirpichev

Misc/NEWS.d/next/C_API/2024-12-14-03-40-15.gh-issue-127925.FF7aov.rst

@@ -1,3 +1,3 @@
-Convert the :mod:`decimal` module to use :pep:`757` API.  That offer some
-speedup, if integer part of the :class:`~decimal.Decimal` instance is small.
-Patch by Sergey B Kirpichev.
+Convert the :mod:`decimal` module to use :pep:`757` C API (export-import
+integers).  That offer some speedup, if integer part of the
+:class:`~decimal.Decimal` instance is small.  Patch by Sergey B Kirpichev.

Modules/_decimal/_decimal.c

@@ -3636,7 +3636,6 @@ dec_format(PyObject *dec, PyObject *args)
 static PyObject *
 dec_as_long(PyObject *dec, PyObject *context, int round)
 {
-    PyObject *pylong;
     digit *ob_digit;
     size_t n;
     mpd_t *x;
@@ -3682,7 +3681,6 @@ dec_as_long(PyObject *dec, PyObject *context, int round)
     /* mpd_sizeinbase can overestimate size by 1 digit, set it to zero. */
     ob_digit[n-1] = 0;
     if (writer == NULL) {
-        PyLongWriter_Discard(writer);
         mpd_del(x);
         return NULL;
     }
@@ -3704,9 +3702,8 @@ dec_as_long(PyObject *dec, PyObject *context, int round)
     }
 
     assert(n > 0);
-    pylong = PyLongWriter_Finish(writer);
     mpd_del(x);
-    return pylong;
+    return PyLongWriter_Finish(writer);
 }
 
 /* Convert a Decimal to its exact integer ratio representation. */