[gobject-introspection] Do not segfault on comments with invalid UTF-8

[Pascal Terjan <pterjan src gnome org>]

commit db47c44565b443d8f1cb1280061762a7bc607a86
Author: Pascal Terjan <pterjan google com>
Date:   Fri Mar 4 00:40:39 2016 +0000

    Do not segfault on comments with invalid UTF-8

 giscanner/giscannermodule.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/giscanner/giscannermodule.c b/giscanner/giscannermodule.c
index cd0718e..4c1f00f 100644
--- a/giscanner/giscannermodule.c
+++ b/giscanner/giscannermodule.c
@@ -631,6 +631,12 @@ pygi_source_scanner_get_comments (PyGISourceScanner *self)
       if (comment->comment)
         {
           comment_obj = PyUnicode_FromString (comment->comment);
+          if (!comment_obj)
+            {
+              g_print ("Comment is not valid Unicode in %s line %d\n", comment->filename, comment->line);
+              Py_INCREF (Py_None);
+              comment_obj = Py_None;
+            }
         }
       else
         {