Hmm, it looks like patchcheck does not fix trailing whitespace in c files:
$ grep ' $' Modules/datetimemodule.c| cat -ve
$
GET_TD_DAYS(offset1) * 86400 - $
Py_DECREF(offset); $
if ((offset1 != offset2) && $
$
$ make patchcheck
-----------------------------------------------
Modules/Setup.dist is newer than Modules/Setup;
check to make sure you have all the updates you
need in your Modules/Setup file.
Usually, copying Modules/Setup.dist to Modules/Setup will work.
-----------------------------------------------
./python.exe ./Tools/scripts/patchcheck.py
Getting the list of files that have been added/changed ... 1 file
Fixing whitespace ... 0 files
Docs modified ... NO
Misc/ACKS updated ... NO
Misc/NEWS updated ... NO
Did you run the test suite?