[PATCH] fsck/main.c: add missing include

[Gao Xiang]

Hi,

On Mon, Dec 06, 2021 at 08:14:03PM +0100, Alexander Kanavin wrote:
> Otherwise musl C library builds fail with missing S_IFMT/S_IFDIR
> definitions.
> 
> Signed-off-by: Alexander Kanavin <alex at linutronix.de>

Thanks for the fix!

Reviewed-by: Gao Xiang <hsiangkao at linux.alibaba.com>

Thanks,
Gao Xiang