Change comments and styles base on review

Change-Id: Idde76114aba0a47b61355677dd33ea9de7deee9d
Signed-off-by: XiaokangQian <xiaokang.qian@arm.com>
diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index 4618d46..c4621e7 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -717,7 +717,7 @@
 #endif /* MBEDTLS_SSL_PROTO_DTLS */
 #if defined(MBEDTLS_SSL_CLI_C) && defined(MBEDTLS_SSL_PROTO_TLS1_3)
     uint16_t hrr_cookie_len;            /*!<  HelloRetryRequest cookie length */
-#endif /* MBEDTLS_SSL_CLI_C || MBEDTLS_SSL_PROTO_TLS1_3 */
+#endif /* MBEDTLS_SSL_CLI_C && MBEDTLS_SSL_PROTO_TLS1_3 */
 
 #if defined(MBEDTLS_SSL_PROTO_DTLS)
     unsigned int out_msg_seq;           /*!<  Outgoing handshake sequence number */