Comment out useless TODO'd if block.

The condition is a potential use after free, because `connection_kill` before it
will delete the `conn` that is dereferenced.

toxcore/net_crypto.c

@@ -2669,12 +2669,15 @@ static void kill_timedout(Net_Crypto *c)
                 continue;
 
             connection_kill(c, i);
-
         }
 
+#if 0
+
         if (conn->status == CRYPTO_CONN_ESTABLISHED) {
             //TODO: add a timeout here?
         }
+
+#endif
     }
 }