[pygobject] Fix Python 2 build warning for module definitions

[Simon Feltman <sfeltman src gnome org>]

commit f2a79904ff4d60bff657bfbfd6a2ce8ab9307848
Author: Simon Feltman <sfeltman src gnome org>
Date:   Tue Jan 14 12:54:42 2014 -0800

    Fix Python 2 build warning for module definitions
    
    Define PYGLIB_MODULE_ERROR_RETURN as NULL for both Python 2 and 3. This is
    needed now that the function signature created with PYGLIB_MODULE_START is
    consistent between the two versions.

 gi/pyglib-python-compat.h |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/gi/pyglib-python-compat.h b/gi/pyglib-python-compat.h
index 5365b20..40e79b4 100644
--- a/gi/pyglib-python-compat.h
+++ b/gi/pyglib-python-compat.h
@@ -30,9 +30,10 @@
     PyCapsule_Import(##module##.##symbol##, FALSE)
 
 
+#define PYGLIB_MODULE_ERROR_RETURN NULL
+
 /* Compilation on Python 2.x */
 #if PY_VERSION_HEX < 0x03000000
-#define PYGLIB_MODULE_ERROR_RETURN
 
 #define RO READONLY
 
@@ -113,8 +114,6 @@ PyTypeObject symbol = {                                 \
 
 #else
 
-#define PYGLIB_MODULE_ERROR_RETURN 0
-
 #define PYGLIB_MODULE_START(symbol, modname)           \
     static struct PyModuleDef _##symbol##module = {     \
     PyModuleDef_HEAD_INIT,                              \