giomodule: Add a NULL guard to extension_point_get_extension_by_name

... otherwise a NULL input will lead to a crash in strcmp.

https://bugzilla.gnome.org/show_bug.cgi?id=727964

diff --git a/gio/giomodule.c b/gio/giomodule.c
index 18b7933..043ec19 100644 (file)
--- a/gio/giomodule.c
+++ b/gio/giomodule.c
@@ -1253,6 +1253,8 @@ g_io_extension_point_get_extension_by_name (GIOExtensionPoint *extension_point,
 {
   GList *l;
 
+  g_return_val_if_fail (name != NULL, NULL);
+
   lazy_load_modules (extension_point);
   for (l = extension_point->extensions; l != NULL; l = l->next)
     {