[gobject-introspection] Use -1 not None for closure/destroy indices

[Owen Taylor <otaylor src gnome org>]

commit 2f7066d7ba462641e1c5b6bc8d5fc5ee850ca87f
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Thu May 6 18:02:22 2010 -0400

    Use -1 not None for closure/destroy indices
    
    Don't assign None to closure and destroy indices in case of
    collision, they are supposed to be numeric.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=617978

 giscanner/annotationparser.py |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/giscanner/annotationparser.py b/giscanner/annotationparser.py
index fa43378..99da0bf 100644
--- a/giscanner/annotationparser.py
+++ b/giscanner/annotationparser.py
@@ -550,12 +550,12 @@ class AnnotationApplier(object):
     def _fixup_param_destroy(self, parent, param):
         for p in parent.parameters:
             if p is not param and p.destroy_index == param.destroy_index:
-                p.destroy_index = None
+                p.destroy_index = -1
 
     def _fixup_param_closure(self, parent, param):
         for p in parent.parameters:
             if p is not param and p.closure_index == param.closure_index:
-                p.closure_index = None
+                p.closure_index = -1
 
     def _parse_param_ret_common(self, parent, node, tag):
         options = getattr(tag, 'options', {})