nixos: don't white-list port 8200 in the firewall when minidlna is enabled

If you want minidla to accept connections from the rest of the world, please
add

    networking.firewall.allowedTCPPorts = [ 8200 ];
    networking.firewall.allowedUDPPorts = [ 1900 ];

to /etc/nixos/configuration.nix.

See <http://lists.science.uu.nl/pipermail/nix-dev/2013-November/011997.html>
for the discussion that lead to this.

nixos/modules/services/networking/minidlna.nix

@@ -55,11 +55,6 @@ in
 
   config = mkIf cfg.enable {
 
-    # Running minidlna only makes sense for serving files to the
-    # outside, so open up the required ports by default.
-    networking.firewall.allowedTCPPorts = [ port ];
-    networking.firewall.allowedUDPPorts = [ 1900 ]; # SSDP
-
     services.minidlna.config =
       ''
         port=${toString port}