bpo-46775: OSError should call winerror_to_errno unconditionally on Windows (GH-32179)

(cherry picked from commit d0c67ea)

Co-authored-by: Dong-hee Na <[email protected]>

Author: miss-islington

Misc/NEWS.d/next/Core and Builtins/2022-03-30-02-36-25.bpo-46775.e3Oxqf.rst

@@ -0,0 +1,3 @@
+Some Windows system error codes(>= 10000) are now mapped into
+the correct errno and may now raise a subclass of :exc:`OSError`.
+Patch by Dong-hee Na.

Objects/exceptions.c

@@ -847,14 +847,7 @@ oserror_parse_args(PyObject **p_args,
             winerrcode = PyLong_AsLong(*winerror);
             if (winerrcode == -1 && PyErr_Occurred())
                 return -1;
-            /* Set errno to the corresponding POSIX errno (overriding
-               first argument).  Windows Socket error codes (>= 10000)
-               have the same value as their POSIX counterparts.
-            */
-            if (winerrcode < 10000)
-                errcode = winerror_to_errno(winerrcode);
-            else
-                errcode = winerrcode;
+            errcode = winerror_to_errno(winerrcode);
             *myerrno = PyLong_FromLong(errcode);
             if (!*myerrno)
                 return -1;