Remove in_hshdr

The first fragment of a fragmented handshake message always starts at the beginning of the buffer so there's no need to store it.

Signed-off-by: Deomid rojer Ryabkov <rojer@rojer.me>
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index eb60c78..0e0bee5 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -1808,8 +1808,8 @@
 
     size_t MBEDTLS_PRIVATE(in_hslen);            /*!< current handshake message length,
                                                     including the handshake header   */
-    unsigned char *MBEDTLS_PRIVATE(in_hshdr);    /*!< original handshake header start  */
-    size_t MBEDTLS_PRIVATE(in_hsfraglen);        /*!< accumulated hs fragments length  */
+    size_t MBEDTLS_PRIVATE(in_hsfraglen);        /*!< accumulated length of hs fragments
+                                                    (up to in_hslen) */
     int MBEDTLS_PRIVATE(nb_zero);                /*!< # of 0-length encrypted messages */
 
     int MBEDTLS_PRIVATE(keep_current_message);   /*!< drop or reuse current message