pv: fixed tobody.params transformation

- len was wrong when having quoted parameters
- patch by Alex Hermann, closes SF#3035382
(cherry picked from commit 6cc5f8ec90db48483d644430bc2628356833fc1e)

modules_k/pv/pv_trans.c

@@ -996,12 +996,8 @@ int tr_eval_tobody(struct sip_msg *msg, tr_param_t *tp, int subtype,
 			if(_tr_tobody.param_lst!=NULL)
 			{
 				val->rs.s = _tr_tobody.param_lst->name.s;
-				if(_tr_tobody.last_param->value.s!=NULL)
-					val->rs.len = _tr_tobody.last_param->value.s
-							+_tr_tobody.last_param->value.len - val->rs.s;
-				else
-					val->rs.len = _tr_tobody.last_param->name.s
-							+_tr_tobody.last_param->name.len - val->rs.s;
+				val->rs.len = _tr_tobody_str.s + _tr_tobody_str.len
+								- val->rs.s;
 			} else val->rs = _tr_empty;
 			break;