Fix reusing session more than once
diff --git a/include/polarssl/ssl.h b/include/polarssl/ssl.h
index 6d00c9d..a25ebea 100644
--- a/include/polarssl/ssl.h
+++ b/include/polarssl/ssl.h
@@ -789,9 +789,14 @@
* \param ssl SSL context
* \param session session context
*
+ * \return 0 if successful,
+ * POLARSSL_ERR_SSL_MALLOC_FAILED if memory allocation failed,
+ * POLARSSL_ERR_SSL_BAD_INPUT_DATA if used server-side or
+ * arguments are otherwise invalid
+ *
* \sa ssl_get_session()
*/
-void ssl_set_session( ssl_context *ssl, const ssl_session *session );
+int ssl_set_session( ssl_context *ssl, const ssl_session *session );
/**
* \brief Set the list of allowed ciphersuites