simplify helper function name

Rename ssl_tls13_check_psk_mode_allowed_by_ticket to
ssl_tls13_ticket_permission_check

Signed-off-by: Pengyu Lv <pengyu.lv@arm.com>
diff --git a/library/ssl_tls13_server.c b/library/ssl_tls13_server.c
index f823933..7bf32c6 100644
--- a/library/ssl_tls13_server.c
+++ b/library/ssl_tls13_server.c
@@ -966,8 +966,8 @@
 
 #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED)
 MBEDTLS_CHECK_RETURN_CRITICAL
-static int ssl_tls13_check_psk_mode_allowed_by_ticket(mbedtls_ssl_context *ssl,
-                                                      unsigned int kex_mode)
+static int ssl_tls13_ticket_permission_check(mbedtls_ssl_context *ssl,
+                                             unsigned int kex_mode)
 {
 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
     if (ssl->handshake->resume) {
@@ -1001,7 +1001,7 @@
 static int ssl_tls13_check_psk_key_exchange(mbedtls_ssl_context *ssl)
 {
 #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_ENABLED)
-    return ssl_tls13_check_psk_mode_allowed_by_ticket(
+    return ssl_tls13_ticket_permission_check(
         ssl, MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK) &&
            mbedtls_ssl_conf_tls13_psk_enabled(ssl) &&
            mbedtls_ssl_tls13_psk_enabled(ssl) &&
@@ -1016,7 +1016,7 @@
 static int ssl_tls13_check_psk_ephemeral_key_exchange(mbedtls_ssl_context *ssl)
 {
 #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL_ENABLED)
-    return ssl_tls13_check_psk_mode_allowed_by_ticket(
+    return ssl_tls13_ticket_permission_check(
         ssl, MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL) &&
            mbedtls_ssl_conf_tls13_psk_ephemeral_enabled(ssl) &&
            mbedtls_ssl_tls13_psk_ephemeral_enabled(ssl) &&