Add missing check for php_openssl_set_server_dh_param()

Author: nielsdos

ext/openssl/xp_ssl.c

@@ -1320,7 +1320,10 @@ static zend_result php_openssl_set_server_specific_opts(php_stream *stream, SSL_
 		php_error_docref(NULL, E_WARNING, "rsa_key_size context option has been removed");
 	}
 
-	php_openssl_set_server_dh_param(stream, ctx);
+	if (php_openssl_set_server_dh_param(stream, ctx) == FAILURE) {
+		return FAILURE;
+	}
+
 	zv = php_stream_context_get_option(PHP_STREAM_CONTEXT(stream), "ssl", "single_dh_use");
 	if (zv == NULL || zend_is_true(zv)) {
 		ssl_ctx_options |= SSL_OP_SINGLE_DH_USE;