Remove '_ext' suffix from SSL key exporter API

Signed-off-by: Hanno Becker <hanno.becker@arm.com>
diff --git a/programs/ssl/ssl_server2.c b/programs/ssl/ssl_server2.c
index 51125bd..334eb7d 100644
--- a/programs/ssl/ssl_server2.c
+++ b/programs/ssl/ssl_server2.c
@@ -2528,19 +2528,19 @@
 #if defined(MBEDTLS_SSL_EXPORT_KEYS)
     if( opt.eap_tls != 0 )
     {
-        mbedtls_ssl_conf_export_keys_ext_cb( &conf, eap_tls_key_derivation,
+        mbedtls_ssl_conf_export_keys_cb( &conf, eap_tls_key_derivation,
                                              &eap_tls_keying );
     }
     else if( opt.nss_keylog != 0 )
     {
-        mbedtls_ssl_conf_export_keys_ext_cb( &conf,
+        mbedtls_ssl_conf_export_keys_cb( &conf,
                                              nss_keylog_export,
                                              NULL );
     }
 #if defined( MBEDTLS_SSL_DTLS_SRTP )
     else if( opt.use_srtp != 0 )
     {
-        mbedtls_ssl_conf_export_keys_ext_cb( &conf, dtls_srtp_key_derivation,
+        mbedtls_ssl_conf_export_keys_cb( &conf, dtls_srtp_key_derivation,
                                              &dtls_srtp_keying );
     }
 #endif /* MBEDTLS_SSL_DTLS_SRTP */