Bug#785495: gdm3: handle new Xorg "-nolisten tcp" default

[Linux - Junior Polegato]

Hi!

I installed GDM3 3.20.1-1 and now has code to solve this problem, but, 
in new code, I suspect that has a failure, because the logic in the line 
331 should be inverse of original code in 336:

daemon/gdm-server.c:331:        if (!server->priv->disable_tcp && ! 
query_in_arglist) {
daemon/gdm-server.c:336:        if (server->priv->disable_tcp && ! 
query_in_arglist) {

I suggest change 331 to:

         if (!server->priv->disable_tcp || query_in_arglist) {


Best regards,

Junior Polegato