Actually set the tlscert conn reference when using OpenSSL

Previously it was always NULL

Author: singpolyma

src/tls_openssl.c

@@ -536,6 +536,7 @@ static int _tls_verify(int preverify_ok, X509_STORE_CTX *x509_ctx)
     X509 *err_cert = X509_STORE_CTX_get_current_cert(x509_ctx);
 
     xmpp_tlscert_t *tlscert = _x509_to_tlscert(conn->ctx, err_cert);
+    tlscert->conn = conn;
 
     if (!tlscert)
         return 0;