[gobject-introspection] Fix incorrect extension for tempfile

[Dieter Verfaillie <dieterv src gnome org>]

commit 241eedc30d220963c966efa7b411dda4531c02ce
Author: Dieter Verfaillie <dieterv optionexplicit be>
Date:   Mon Sep 19 20:20:35 2011 +0200

    Fix incorrect extension for tempfile
    
    I set ext to None in commit f2a70843905839a1b11795310d2aa3b85a474e77
    without realizing _generate_tempfile does a simple string formatting.
    A simple test proves this does not generate an empty string:
    
    $ python -c "f = '%s' % None; print f, type(f)"
    None <type 'str'>
    
    So pass an empty string instead of None for the suffix parameter.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=659502

 giscanner/dumper.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/giscanner/dumper.py b/giscanner/dumper.py
index a6347d8..1a8fdb5 100644
--- a/giscanner/dumper.py
+++ b/giscanner/dumper.py
@@ -149,7 +149,7 @@ class DumpCompiler(object):
         if os.name == 'nt':
             ext = 'exe'
         else:
-            ext = None
+            ext = ''
 
         bin_path = self._generate_tempfile(tmpdir, ext)