[gtk+/gtk-3-8] win32: do not crash on invalid utf8 conversion

[Matthias Clasen <matthiasc src gnome org>]

commit e3e8783c988695130f26996bbde3664c99270523
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 7a3671b..a260322 100644
--- a/gdk/win32/gdkproperty-win32.c
+++ b/gdk/win32/gdkproperty-win32.c
@@ -150,6 +150,7 @@ _gdk_win32_window_change_property (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));
@@ -193,7 +194,13 @@ _gdk_win32_window_change_property (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;