vtls_scache: fix possible null ptr deref

Pointed out by CodeSonar. It is probably not reachable, but might as
well just add a precaution.

Closes #15950

diff --git a/lib/vtls/vtls_scache.c b/lib/vtls/vtls_scache.c
index 937cb8c87ec0e235c17997d1097ec2a3cfa54bf8..9c04b7762300c88699ad977301ea7c238ee1d1a9 100644 (file)
--- a/lib/vtls/vtls_scache.c
+++ b/lib/vtls/vtls_scache.c
@@ -783,7 +783,7 @@ out:
                   "quic_tp=%s], peer has %zu sessions now",
                   ssl_peer_key, s->ietf_tls_id, s->valid_until - now,
                   s->alpn, s->earlydata_max, s->quic_tp ? "yes" : "no",
-                  Curl_llist_count(&peer->sessions));
+                  peer ? Curl_llist_count(&peer->sessions) : 0);
   return result;
 }