Mark psyco_set_error as returning a borrowed object

psycopg/utils.c

@@ -365,8 +365,7 @@ exit:
  * Create a new error of the given type with extra attributes.
  */
 
-/* TODO: may have been changed to BORROWED */
-RAISES PyObject *
+RAISES BORROWED PyObject *
 psyco_set_error(PyObject *exc, cursorObject *curs, const char *msg)
 {
     PyObject *pymsg;

psycopg/utils.h

@@ -53,7 +53,7 @@ HIDDEN PyObject *psycopg_make_dsn(PyObject *dsn, PyObject *kwargs);
 HIDDEN PyObject *psycopg_text_from_chars_safe(
     const char *str, Py_ssize_t len, PyObject *decoder);
 
-RAISES HIDDEN PyObject *psyco_set_error(
+HIDDEN RAISES BORROWED PyObject *psyco_set_error(
     PyObject *exc, cursorObject *curs, const char *msg);
 
 HIDDEN PyObject *psyco_GetDecimalType(void);