tls13: Rename early_data_count to total_early_data_size

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/library/ssl_tls13_generic.c b/library/ssl_tls13_generic.c
index c5698f6..eec2bb4 100644
--- a/library/ssl_tls13_generic.c
+++ b/library/ssl_tls13_generic.c
@@ -1477,11 +1477,11 @@
      */
     if (uint32_early_data_len >
         (ssl->session_negotiate->max_early_data_size -
-         ssl->early_data_count)) {
+         ssl->total_early_data_size)) {
 
         MBEDTLS_SSL_DEBUG_MSG(
             2, ("EarlyData: Too much early data received, %u > %u",
-                ssl->early_data_count + uint32_early_data_len,
+                ssl->total_early_data_size + uint32_early_data_len,
                 ssl->session_negotiate->max_early_data_size));
 
         MBEDTLS_SSL_PEND_FATAL_ALERT(
@@ -1490,7 +1490,7 @@
         return MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE;
     }
 
-    ssl->early_data_count += uint32_early_data_len;
+    ssl->total_early_data_size += uint32_early_data_len;
 
     return 0;
 }