don't use empty string for user-agent

diff --git a/src/libvlc-module.c b/src/libvlc-module.c
index f9dbdce9b03f41ddbe8b6d7b9ebb4f641e7ec404..5c696f2b5db7b307aa3b8e0f6a32d82d130795d3 100644 (file)
--- a/src/libvlc-module.c
+++ b/src/libvlc-module.c
@@ -2057,7 +2057,7 @@ vlc_module_begin ()
                    DATA_PATH_LONGTEXT, true )
         change_need_restart ()
 
-    add_string( "user-agent", "(LibVLC "VERSION")", NULL, "", "", true )
+    add_string( "user-agent", "(LibVLC "VERSION")", NULL, NULL, NULL, true )
         change_safe ()
         change_private ()