auth/pycreds/encrypt_netr_crypt_password: don't pretend arg is optional

The "|O" signature is saying the password argument is optional, which
makes no sense in terms of the funxtion and immediately leads to a
TypeError (or until last commit, segfault). Removing the "|" leaves it
with a TypeError, but it is better worded and faster.

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

auth/credentials/pycredentials.c

@@ -906,7 +906,7 @@ static PyObject *py_creds_encrypt_netr_crypt_password(PyObject *self,
 		return NULL;
 	}
 
-	if (!PyArg_ParseTuple(args, "|O", &py_cp)) {
+	if (!PyArg_ParseTuple(args, "O", &py_cp)) {
 		return NULL;
 	}