* gtk: fixed a segfault with deinterlace.

modules/gui/gtk/menu.c

@@ -2,7 +2,7 @@
  * menu.c : functions to handle menu items.
  *****************************************************************************
  * Copyright (C) 2000, 2001 VideoLAN
- * $Id: menu.c,v 1.4 2003/01/20 20:07:07 fenrir Exp $
+ * $Id: menu.c,v 1.5 2003/01/22 00:32:32 fenrir Exp $
  *
  * Authors: Samuel Hocevar <sam@zoy.org>
  *          Stphane Borel <stef@via.ecp.fr>
@@ -372,6 +372,8 @@ static void GtkDeinterlaceUpdate( intf_thread_t *p_intf, char *psz_mode )
         free( psz_filter );
 
     /* now restart all video stream */
+    if( p_intf->p_sys->p_input )
+    {
         vlc_mutex_lock( &p_intf->p_sys->p_input->stream.stream_lock );
 #define ES p_intf->p_sys->p_input->stream.pp_es[i]
         /* create a set of language buttons and append them to the container */
@@ -386,6 +388,7 @@ static void GtkDeinterlaceUpdate( intf_thread_t *p_intf, char *psz_mode )
 #undef ES
         }
         vlc_mutex_unlock( &p_intf->p_sys->p_input->stream.stream_lock );
+    }
 }
 
 static void GtkMenubarDeinterlaceToggle( GtkCheckMenuItem * menuitem, gpointer user_data )