compel: be silent if no errors

In case of success, we want to be silent when on default log level.

This is a time-honored UNIX tradition, who we are to break it?
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

compel/src/main.c

@@ -103,7 +103,7 @@ err:
 	if (opts.fout)
 		fclose(opts.fout);
 	if (!ret)
-		printf("%s generated successfully.\n", opts.output_filename);
+		pr_info("%s generated successfully.\n", opts.output_filename);
 	return ret;
 }