got rid of a write system call

git-svn-id: svn://svn.code.sf.net/p/axtls/code/trunk@39 9a5d90b5-6617-0410-8a86-bb477d3ed2e3

ssl/crypto.h

@@ -269,7 +269,8 @@ typedef void (*hmac_func)(const uint8_t *msg, int length, const uint8_t *key,
 
 typedef struct
 {
-    uint8_t *data;
+    uint8_t *pre_data;	/* include the ssl record bytes */
+    uint8_t *data;	/* the regular ssl data */
     int max_len;
     int index;
 } BUF_MEM;