fix various issues

- typo error
- replace `ssl->hanshake` with handshake

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/ssl_client.c b/library/ssl_client.c
index b226caf..0f0ea1d 100644
--- a/library/ssl_client.c
+++ b/library/ssl_client.c
@@ -676,7 +676,7 @@
 
 #if defined(MBEDTLS_SSL_PROTO_TLS1_3)
     MBEDTLS_SSL_PRINT_EXTS(
-        3, MBEDTLS_SSL_HS_CLIENT_HELLO, ssl->handshake->sent_extensions );
+        3, MBEDTLS_SSL_HS_CLIENT_HELLO, handshake->sent_extensions );
 #endif
 
     *out_len = p - buf;