tls13: Rename early_data_count to total_early_data_size

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index ee72179..5bedd91 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -1105,7 +1105,7 @@
 #if defined(MBEDTLS_SSL_SRV_C)
     ssl->discard_early_data_record = MBEDTLS_SSL_EARLY_DATA_NO_DISCARD;
 #endif
-    ssl->early_data_count = 0;
+    ssl->total_early_data_size = 0;
 #endif /* MBEDTLS_SSL_EARLY_DATA */
 
     /* Initialize structures */