generator expression function does not follow signature changes

[scoder]

When the always_allow_keywords option is enabled, the call to the generator expression function still thinks it has a NOARGS signature. This leads to invalid C code as the call and the function signature are out of sync.

Example from pyregr test_bytes.py in Py2.7:

static PyObject *__pyx_pf_10test_bytes_14test_from_list_genexpr(PyObject *__pyx_self, PyObject *__pyx_args, PyObject *__pyx_kwds); /*proto*/

 ...
 *         b = self.type2test(i for i in ints)    # <<<<<<<<<<<<<<

  __pyx_t_2 = __pyx_pf_10test_bytes_14test_from_list_genexpr(((PyObject*)__pyx_cur_scope), NULL); if /*...*/

[vitja]

Fixed here  https://github.com/cython/cython/commit/7c01e8488e12f5e7581a356df5882d5329457369