tls13: cli: Rename STATE_UNKNOWN to STATE_IDLE

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 97235ef..681ccab 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -1096,7 +1096,7 @@
 
 #if defined(MBEDTLS_SSL_EARLY_DATA)
 #if defined(MBEDTLS_SSL_CLI_C)
-    ssl->early_data_state = MBEDTLS_SSL_EARLY_DATA_STATE_UNKNOWN;
+    ssl->early_data_state = MBEDTLS_SSL_EARLY_DATA_STATE_IDLE;
 #endif
 #if defined(MBEDTLS_SSL_SRV_C)
     ssl->discard_early_data_record = MBEDTLS_SSL_EARLY_DATA_NO_DISCARD;