Disconnect on invalid snap item

Do not leave a timeouted tee on the server if the snap is
parsed wrong

lib/game_client.rb

@@ -158,7 +158,7 @@ class GameClient
   end
 
   def on_snapshot(chunk)
-    u = SnapshotUnpacker.new
+    u = SnapshotUnpacker.new(@client)
     snapshot = u.snap_single(chunk)
 
     return if snapshot.nil?

lib/snapshot/unpacker.rb

@@ -29,6 +29,10 @@ class Snapshot
 end
 
 class SnapshotUnpacker
+  def initialize(client)
+    @client = client
+  end
+
   def snap_single(chunk)
     u = Unpacker.new(chunk.data)
     msg_id = u.get_int
@@ -195,6 +199,7 @@ class SnapshotUnpacker
         end
       end
       puts 'Error: got invalid snap item'
+      @client.disconnect
       exit 1
     end