Fixed uninit len for th_contact_encode_passwd param.

As the used len was all the time 10 (the len of the default passwd), if you have set a shorter one, the actual used passwd has some trailing memory garbage (up to 10 char len). This grabage could be (99.999%) constant during runtime, but 100% different after a restart. Shorly, the decoding on ongoing contact would have failed after a restart.

(cherry picked from commit 4a17a82)

modules/topology_hiding/topology_hiding.c

@@ -127,6 +127,7 @@ static int mod_init(void)
 	topo_hiding_prefix.len = strlen(topo_hiding_prefix.s);
 	topo_hiding_seed.len = strlen(topo_hiding_seed.s);
 	th_contact_encode_param.len = strlen(th_contact_encode_param.s);
+	topo_hiding_ct_encode_pw.len = strlen(topo_hiding_ct_encode_pw.s);
 	if (topo_hiding_ct_params.s) {
 		topo_hiding_ct_params.len = strlen(topo_hiding_ct_params.s);
 		topo_parse_passed_ct_params(&topo_hiding_ct_params);