Fix fishy sizeof(Py_ssize_t *).

sizeof(Py_ssize_t *) == sizeof(Py_ssize_t) but it's not a portable assumption.
CID 486403

Modules/_ctypes/_ctypes.c

@@ -1326,7 +1326,7 @@ PyCArrayType_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
     if (stgdict->format == NULL)
         goto error;
     stgdict->ndim = itemdict->ndim + 1;
-    stgdict->shape = PyMem_Malloc(sizeof(Py_ssize_t *) * stgdict->ndim);
+    stgdict->shape = PyMem_Malloc(sizeof(Py_ssize_t) * stgdict->ndim);
     if (stgdict->shape == NULL)
         goto error;
     stgdict->shape[0] = length;