quic: prevent copying ngtcp2_cid

The existing code explicitly uses the CID(const ngtcp2_cid*) constructor
that does not copy the given ngtcp2_cid, but the range-based for loop
still unnecessarily copies the ngtcp2_cid. Use auto& to avoid copying.

PR-URL: #48561
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Mohammed Keyvanzadeh <[email protected]>

Author: tniessen

src/quic/session.cc

@@ -643,7 +643,7 @@ void Session::Destroy() {
   endpoint_->DisassociateCID(config_.dcid);
   endpoint_->DisassociateCID(config_.preferred_address_cid);
 
-  for (auto cid : cids) endpoint_->DisassociateCID(CID(&cid));
+  for (const auto& cid : cids) endpoint_->DisassociateCID(CID(&cid));
 
   for (const auto& token : tokens) {
     if (token.token_present)