Optimize code (pake role type, freeing buffers)

Signed-off-by: Przemek Stekiel <przemyslaw.stekiel@mobica.com>
diff --git a/include/mbedtls/ecjpake.h b/include/mbedtls/ecjpake.h
index 94864fa..0008d73 100644
--- a/include/mbedtls/ecjpake.h
+++ b/include/mbedtls/ecjpake.h
@@ -52,9 +52,9 @@
  * Roles in the EC J-PAKE exchange
  */
 typedef enum {
-    MBEDTLS_ECJPAKE_NONE = 0,           /**< Undefined                      */
-    MBEDTLS_ECJPAKE_CLIENT,             /**< Client                         */
+    MBEDTLS_ECJPAKE_CLIENT = 0,         /**< Client                         */
     MBEDTLS_ECJPAKE_SERVER,             /**< Server                         */
+    MBEDTLS_ECJPAKE_NONE,               /**< Undefined                      */
 } mbedtls_ecjpake_role;
 
 #if !defined(MBEDTLS_ECJPAKE_ALT)