CT code now calls X509_free() after calling SSL_get_peer_certificate()

Without this, the peer certificate would never be deleted, resulting in
a memory leak.
Reviewed-by: NEmilia Käsper <emilia@openssl.org>
Reviewed-by: NRich Salz <rsalz@openssl.org>

ssl/ssl_lib.c

@@ -3941,6 +3941,7 @@ static int ct_extract_x509v3_extension_scts(SSL *s)
             ct_move_scts(&s->scts, scts, SCT_SOURCE_X509V3_EXTENSION);
 
         SCT_LIST_free(scts);
+        X509_free(cert);
     }
 
     return scts_extracted;
@@ -4071,6 +4072,7 @@ int SSL_validate_ct(SSL *s)
 
 end:
     CT_POLICY_EVAL_CTX_free(ctx);
+    X509_free(cert);
     return ret;
 }