Ticket #56254: patch_client_authentication.cc.diff

mysql-5.6.39/sql-common/client_authentication.

@@ -84 +84 @@
 
   if (mysql->options.extension != NULL &&
       mysql->options.extension->server_public_key_path != NULL &&
-      mysql->options.extension->server_public_key_path != '\0')
+      mysql->options.extension->server_public_key_path[0] != '\0')
   {
     pub_key_file= fopen(mysql->options.extension->server_public_key_path,
                         "r");