Add missing semicolon in TLS 1.3 transform generation code

Signed-off-by: Hanno Becker <hanno.becker@arm.com>
diff --git a/library/ssl_tls13_keys.c b/library/ssl_tls13_keys.c
index 8270009..91384f2 100644
--- a/library/ssl_tls13_keys.c
+++ b/library/ssl_tls13_keys.c
@@ -731,7 +731,7 @@
     {
         MBEDTLS_SSL_DEBUG_MSG( 1, ( "cipher info for %u not found",
                                     ciphersuite_info->cipher ) );
-        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA )
+        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
     }
 
     /*