[pygobject] Correct Gtk.TreePath.__iter__ to work with Python 3

[Johan Dahlin <johan src gnome org>]

commit 77d358f8c5f524259249ea686899e3a4da05562e
Author: Johan Dahlin <johan gnome org>
Date:   Mon Mar 19 11:54:07 2012 -0300

    Correct Gtk.TreePath.__iter__ to work with Python 3

 gi/overrides/Gtk.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gi/overrides/Gtk.py b/gi/overrides/Gtk.py
index 1ce17af..9d3ba0a 100644
--- a/gi/overrides/Gtk.py
+++ b/gi/overrides/Gtk.py
@@ -1166,7 +1166,7 @@ class TreePath(Gtk.TreePath):
         return other is None or self.compare(other) >= 0
 
     def __iter__(self):
-        return iter(map(int, str(self).split(':')))
+        return (int(part) for part in str(self).split(':'))
 
 TreePath = override(TreePath)
 __all__.append('TreePath')