Issue #16305: Merge fix from 3.2.

Misc/NEWS

@@ -879,6 +879,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #16305: Fix a segmentation fault occurring when interrupting
+  math.factorial.
+
 - Issue #9803: Don't close IDLE on saving if breakpoint is open.
   Patch by Roger Serwy.
 

Modules/mathmodule.c

@@ -1381,14 +1381,13 @@ factorial_odd_part(unsigned long n)
         Py_DECREF(outer);
         outer = tmp;
     }
-
-    goto done;
+    Py_DECREF(inner);
+    return outer;
 
   error:
     Py_DECREF(outer);
-  done:
     Py_DECREF(inner);
-    return outer;
+    return NULL;
 }
 
 /* Lookup table for small factorial values */