erofs-utils: fix consistency + add NUL after root path

[Gao Xiang]

Hi Igor,

On Sat, Dec 18, 2021 at 04:35:37AM +0200, Igor Eisberg wrote:
> From 8b209620abfbd8147a2c771cb0126dcca528e34f Mon Sep 17 00:00:00 2001
> From: Igor Ostapenko <igoreisberg at gmail.com>
> Date: Sat, 18 Dec 2021 04:30:17 +0200
> Subject: erofs-utils: fix consistency + add NUL after root path
> 
> Signed-off-by: Igor Ostapenko <igoreisberg at gmail.com>

Thanks for these catches! If you don't mind, I've folded these
into corresponding patches.

Thanks,
Gao Xiang