[gtk+/gtk-2-24] win32: do not crash on invalid utf8 conversion

[Marc-Andre Lureau <malureau src gnome org>]

commit ed081e30b62b4c220381c8275ea5a8f7804ef449
Author: Marc-André Lureau <marcandre lureau gmail com>
Date:   Wed Mar 20 23:12:56 2013 +0100

    win32: do not crash on invalid utf8 conversion
    
    g_utf8_to_utf16() is not guaranteed to succeed. Check the error
    and return if it failed.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=696232

 gdk/win32/gdkproperty-win32.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/gdk/win32/gdkproperty-win32.c b/gdk/win32/gdkproperty-win32.c
index 88a29e8..88c8c1b 100644
--- a/gdk/win32/gdkproperty-win32.c
+++ b/gdk/win32/gdkproperty-win32.c
@@ -158,6 +158,7 @@ gdk_property_change (GdkWindow    *window,
   guchar *ucptr;
   wchar_t *wcptr, *p;
   glong wclen;
+  GError *err = NULL;
 
   g_return_if_fail (window != NULL);
   g_return_if_fail (GDK_IS_WINDOW (window));
@@ -207,7 +208,13 @@ gdk_property_change (GdkWindow    *window,
              return;
            }
 
-         wcptr = g_utf8_to_utf16 ((char *) data, nelements, NULL, &wclen, NULL);
+         wcptr = g_utf8_to_utf16 ((char *) data, nelements, NULL, &wclen, &err);
+          if (err != NULL)
+            {
+              g_warning ("Failed to convert utf8: %s", err->message);
+              g_clear_error (&err);
+              return;
+            }
 
          wclen++;              /* Terminating 0 */
          size = wclen * 2;