xz: Hide the number of input files with recursive mode.

In recursive mode we don't know how many files to process at the
beginning. So just like when using --files or --files0, the number of
total files will not be shown.

src/xz/main.c

@@ -412,7 +412,7 @@ main(int argc, char **argv)
 
 	// Tell the message handling code how many input files there are if
 	// we know it. This way the progress indicator can show it.
-	if (args.files_name != NULL)
+	if (args.files_name != NULL || opt_recursive)
 		message_set_files(0);
 	else
 		message_set_files(args.arg_count);