Merge "btm_iso: Relax iso_handle check for read link quality function"

  void read_iso_link_quality(uint16_t iso_handle) {

    iso_base* iso = GetIsoIfKnown(iso_handle);

    LOG_ASSERT(iso != nullptr) << "No such iso connection";

    if (iso == nullptr) {

      LOG(ERROR) <<__func__ << "No such iso connection: " << +iso_handle;

      return;

    }

    btsnd_hcic_read_iso_link_quality(

        iso_handle, base::BindOnce(&iso_impl::on_iso_link_quality_read,