Remove field to store level of pending alert

Pending alerts is so far only used for fatal alerts.
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 1d500c4..c9a9e29 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -7975,7 +7975,6 @@
         goto error;
 
     ssl->pend_alert_msg   = MBEDTLS_SSL_ALERT_MSG_NONE;
-    ssl->pend_alert_level = MBEDTLS_SSL_ALERT_LEVEL_FATAL;
 
     return( 0 );
 
@@ -9832,10 +9831,9 @@
     if( ssl->pend_alert_msg != MBEDTLS_SSL_ALERT_MSG_NONE )
     {
         mbedtls_ssl_send_alert_message( ssl,
-                                        ssl->pend_alert_level,
+                                        MBEDTLS_SSL_ALERT_LEVEL_FATAL,
                                         ssl->pend_alert_msg );
         ssl->pend_alert_msg   = MBEDTLS_SSL_ALERT_MSG_NONE;
-        ssl->pend_alert_level = MBEDTLS_SSL_ALERT_LEVEL_FATAL;
     }
     return( ret );
 }