Fixed NULL pointer dereference in stream_socket_enable_crypto, case when

ssl_handle of session_stream is not initialized.

ext/openssl/xp_ssl.c

@@ -406,6 +406,8 @@ static inline int php_openssl_setup_crypto(php_stream *stream,
 	if (cparam->inputs.session) {
 		if (cparam->inputs.session->ops != &php_openssl_socket_ops) {
 			php_error_docref(NULL TSRMLS_CC, E_WARNING, "supplied session stream must be an SSL enabled stream");
+		} else if (((php_openssl_netstream_data_t*)cparam->inputs.session->abstract)->ssl_handle == NULL) {
+			php_error_docref(NULL TSRMLS_CC, E_WARNING, "supplied SSL session stream is not initialized");
 		} else {
 			SSL_copy_session_id(sslsock->ssl_handle, ((php_openssl_netstream_data_t*)cparam->inputs.session->abstract)->ssl_handle);
 		}